GREENSTREET
      ACQUISITION CORP.

    


    SPONSOR
      WARRANTS SUBSCRIPTION AGREEMENT

    


    THIS
      SPONSOR WARRANTS SUBSCRIPTION AGREEMENT
      (this “Agreement”) is made as of the 14th day of January, 2008, by and between
      Greenstreet Acquisition Corp., a Delaware corporation (the “Company”), and GRST
      Acquisition, LLC (“Purchaser”).

    


    WHEREAS,
      the Company desires to commit to issue and sell, and Purchaser desires to commit
      to purchase and acquire, Warrants (as defined herein) on the terms and
      conditions hereinafter set forth;

    


    NOW,
      THEREFORE, for and in consideration of the promises and mutual covenants set
      forth herein, it is agreed between the parties as follows:

    


    1.
      Commitment
      To Purchase Warrants.
      Subject to and immediately prior to the consummation of the Company’s initial
      public offering (the “IPO”), Purchaser hereby agrees to subscribe for and
      purchase from the Company, and the Company hereby agrees to issue and sell
      to
      Purchaser, 4,610,000 warrants (each a “Warrant”) at a purchase price of
      $1.00 per Warrant for an aggregate purchase price of $4,610,000 Each Warrant
      shall entitle the holder thereof to purchase one share of the common stock
      of
      the Company, par value $0.001 per share (the “Common Stock”) at an exercise
      price of $6.00, in accordance with the terms of the Warrant as set forth in
      the
      Warrant Agreement (the “Warrant Agreement”) dated as of December 14, 2007 by and
      between the Company and American Stock Transfer & Trust Company, as warrant
      agent. The closing of the purchase and sale of the Warrants hereunder, including
      payment for and delivery of the Warrants, shall occur at the offices of the
      Company immediately prior to, and subject to consummation of, the
      IPO.

    


    2.
      Payment
      of Purchase Price.
      The purchase price for the Warrants (also referred to herein as the
“Securities”) shall be tendered in full at the closing by one or a combination
      of the following means:

    


    (a)
      wiring of immediately available United States funds to an account for the
      benefit of the Company, pursuant to wire instructions provided by the Company
      in
      advance; or

    


    (b)
      by delivery of a cashiers check to the Company of immediately available United
      States funds.

    


    3.
      Acceptance
      or Rejection of Agreement.
      The Company has the right to reject this Agreement and any subscription for
      the
      Securities represented hereby in whole or in part, for any reason and at any
      time prior to a closing, notwithstanding receipt by Purchaser or prior notice
      of
      acceptance of such subscription. The Securities subscribed for herein will
      not
      be deemed issued to or owned by Purchaser until a copy of this Agreement has
      been executed by the Company and Purchaser and a closing with respect to such
      Securities has occurred. In the event that a closing does not take place for
      any
      reason with respect to some or all of the Securities, all cash proceeds
      delivered by Purchaser in accordance herewith with respect to such Securities
      shall be returned to Purchaser as soon as practicable, without interest, offset
      or deduction.

    


    
      
        
        

      

      
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    4.
      Limitations
      on Transfer.
      Purchaser shall not assign, hypothecate, donate, encumber or otherwise dispose
      of any interest in the Warrants (and any shares of Common Stock issuable in
      respect thereof) during the “Escrow Period” for the “Sponsor Warrants” (as such
      terms are defined in a securities escrow agreement substantially in the form
      attached hereto as Exhibit A (the “Securities Escrow Agreement”), dated on or
      about the effective date of the IPO to be entered into by and between the
      Company and an escrow agent to be determined by the Company), except (i) as
      otherwise permitted by the Securities Escrow Agreement, (ii) in compliance
      with
      applicable securities laws and (iii) in compliance with the Warrant
      Agreement.

    


    5.
      Restrictive
      Legends.
      All certificates representing the Securities (and any underlying securities
      thereof) shall have endorsed thereon legends in substantially the following
      forms (in addition to any other legend which may be required by other agreements
      between the parties hereto):

    


    (a)
      “THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER
      THE SECURITIES ACT OF 1933, AS AMENDED. THE SECURITIES MAY NOT BE SOLD, OFFERED
      FOR SALE, PLEDGED OR HYPOTHECATED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
      STATEMENT AS TO THE SECURITIES UNDER SAID ACT OR AN OPINION OF COUNSEL
      SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION IS NOT
      REQUIRED.”

    


    (b)
      “THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY NOT BE ASSIGNED,
      HYPOTHECATED, DONATED, ENCUMBERED, SOLD, TRANSFERRED OR OTHERWISE DISPOSED
      OF
      EXCEPT IN ACCORDANCE WITH THAT CERTAIN SECURITIES ESCROW AGREEMENT DATED
      ____________, 2008, AND THAT CERTAIN WARRANT AGREEMENT DATED AS OF DECEMBER
      14,
      2007, COPIES OF WHICH ARE AVAILABLE FOR INSPECTION AT THE OFFICES OF THE
      COMPANY.”

    


    (c)
      Any legend required by appropriate blue sky officials.

    


    6.
      Investment
      Representations.
      In connection with the purchase of the Securities, Purchaser represents to
      the
      Company the following:

    


    (a)
      Purchaser has been furnished with all materials relating to the Company’s
      business affairs and financial condition and materials related to the offer
      and
      sale of the Securities that have been requested by Purchaser and has acquired
      sufficient information about the Company to reach an informed and knowledgeable
      decision to acquire the Securities. Purchaser has been afforded the opportunity
      to ask questions of the executive officer and director of the Company. Purchaser
      understands that its investment in the Securities involves a high degree of
      risk. Purchaser has sought such accounting, legal and tax advice as Purchaser
      has considered necessary to make an informed investment decision with respect
      to
      Purchaser’s acquisition of the Securities. Purchaser has such knowledge and
      expertise in financial and business matters, knows of the high degree of risk
      associated with investments generally and particularly investments in the
      securities of companies in the development stage such as the Company, is capable
      of evaluating the merits and risks of an investment in the Securities, and
      is
      able to bear the economic risk of an investment in the Securities in the amount
      contemplated hereunder. Purchaser has adequate means of providing for its
      current financial needs and contingencies and will have no current or
      anticipated future needs for liquidity which would be jeopardized by the
      investment in the Securities. Purchaser can afford a complete loss of its
      investment in the Securities. Purchaser is purchasing the Securities for
      investment for Purchaser’s own account only and not with a view to, or for
      resale in connection with, any “distribution” thereof within the meaning of the
      Securities Act of 1933, as amended (the “Act”). Purchaser understands that the
      Company is a blank check development stage company recently formed for the
      purpose of consummating an initial business combination (a “Business
      Combination”) and understands that there is no assurance as to the future
      performance of the Company and that the Company may never effectuate a Business
      Combination.

    


    
      
        
        

      

      
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    (b)
      Purchaser understands that the Securities (and the underlying securities
      thereof) have not been registered under the Act or any state securities law
      by
      reason of a specific exemption therefrom, and that the Company is relying on
      the
      truth and accuracy of, and Purchaser’s compliance with, the representations and
      warranties and agreements of Purchaser set forth herein to determine the
      availability of such exemptions and the eligibility of Purchaser to acquire
      such
      Securities, including, but not limited to, the bona fide nature of Purchaser’s
      investment intent as expressed herein.

    


    (c)
      Purchaser further acknowledges and understands that the Securities (and the
      underlying securities thereof) must be held indefinitely unless the Securities
      (and the underlying securities thereof) are subsequently registered under the
      Act or an exemption from such registration is available. Purchaser understands
      that the certificates evidencing the Securities (and the underlying securities
      thereof) will be imprinted with a legend which prohibits the transfer of the
      Securities (and the underlying securities thereof) unless the Securities (and
      the underlying securities thereof) are registered or such registration is not
      required in the opinion of counsel for the Company.

    


    (d)
      Purchaser is familiar with the provisions of Rule 144 under the Act, as in
      effect from time to time (“Rule 144”), which, in substance, permit limited
      public resale of “restricted securities”
      acquired, directly or indirectly, from the issuer thereof (or from an affiliate
      of such issuer), in a non-public offering subject to the satisfaction of certain
      conditions. Unless the Company registers the Securities (and the underlying
      securities thereof) under the Act, the Securities (and the underlying securities
      thereof) may be resold by Purchaser only in certain limited circumstances
      subject to the provisions of Rule 144, which requires, among other things:
      (i)
      the availability of certain public information about the Company and (ii) the
      resale occurring following the required holding period under Rule 144 after
      Purchaser has purchased, and made full payment of (within the meaning of Rule
      144), the securities to be sold.

    


    (e)
      Purchaser further understands that at the time Purchaser wishes to sell the
      Securities there may be no public market upon which to make such a sale, and
      that, even if such a public market then exists, the Company may not be
      satisfying the current public information requirements of Rule 144, and that,
      in
      such event, Purchaser would be precluded from selling the Securities (and the
      underlying securities thereof) under Rule 144 even if the minimum holding period
      requirement had been satisfied. Notwithstanding Sections 6(d) and (e) hereof,
      Purchaser understands that he may be considered a promoter of the Company and
      understands that it is the position of the Securities and Exchange Commission
      (the “SEC”) that promoters or affiliates of a blank check company and their
      transferees, both before and after a Business Combination, would act as an
      “underwriter” under the Act when reselling the securities of a blank check
      company. Accordingly, the SEC believes that those securities can be resold
      only
      through a registered offering and that Rule 144 would not be available for
      those
      resale transactions despite technical compliance with the requirements of Rule
      144. 

    


    (f)
      Purchaser represents that Purchaser is an “accredited investor” as that term is
      defined in Rule 501 of Regulation D promulgated by the SEC under the Act.


    


    (g)
      Purchaser has all necessary limited liability company power and authority to
      enter into this Agreement and to consummate the transactions contemplated
      hereby. All limited liability company action necessary to be taken by Purchaser
      to authorize the execution, delivery and performance of this Agreement and
      all
      other agreements and instruments delivered by Purchaser in connection with
      the
      transactions contemplated hereby has been duly and validly taken, and this
      Agreement has been duly executed and delivered by Purchaser. Subject to the
      terms and conditions of this Agreement, this Agreement constitutes the valid,
      binding and enforceable obligation of Purchaser, enforceable in accordance
      with
      its terms, except as enforceability may be limited by (i) applicable bankruptcy,
      insolvency, reorganization, moratorium, fraudulent transfer or similar laws
      of
      general application now or hereafter in effect affecting the rights and remedies
      of creditors and by general principles of equity (regardless of whether
      enforcement is sought in a proceeding at law or in equity); and (ii) the
      applicability of the federal and state securities laws and public policy as
      to
      the enforceability of the indemnification provisions of this Agreement. The
      purchase by Purchaser of the Securities does not conflict with the
      organizational documents of Purchaser or any material contract by which
      Purchaser or its property is bound, or any laws or regulations or decree, ruling
      or judgment of any court applicable to Purchaser or its property. The principal
      place of business of Purchaser is as set forth on the signature page
      hereto.

    


    
      
        
        

      

      
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    (h)
      Purchaser did not decide to enter into this Agreement as a result of any general
      solicitation or general advertising within the meaning of Rule 502(c) of the
      Securities Act.

    


    (i)
      Purchaser understands that no United States federal or state agency or any
      other
      government or governmental agency has passed on or made any recommendation
      or
      endorsement of the Securities or the fairness or suitability of the investment
      in the Securities, nor have such authorities passed upon or endorsed the merits
      of the offering of the Securities.

    


    7.
      Company
      Representations and Warranties.
      The Company hereby represents and warrants to Purchaser that the Company has
      all
      necessary corporate power and authority to enter into this Agreement and to
      consummate the transactions contemplated hereby. All corporate action necessary
      to be taken by the Company to authorize the execution, delivery and performance
      of this Agreement and all other agreements and instruments delivered by the
      Company in connection with the transactions contemplated hereby has been duly
      and validly taken and this Agreement has been duly executed and delivered by
      the
      Company. Subject to the terms and conditions of this Agreement, this Agreement
      constitutes the valid, binding and enforceable obligation of the Company,
      enforceable in accordance with its terms, except as enforceability may be
      limited by (i) applicable bankruptcy, insolvency,
      reorganization, moratorium, fraudulent transfer or similar laws of general
      application now or hereafter in effect affecting the rights and remedies of
      creditors and by general principles of equity (regardless of whether enforcement
      is sought in a proceeding at law or in equity); and (ii) the applicability
      of
      the federal and state securities laws and public policy as to the enforceability
      of the indemnification provisions of this Agreement. The sale by the Company
      of
      the Securities does not conflict with the certificate of incorporation or
      by-laws of the Company or any material contract by which the Company or its
      property is bound, or any federal or state laws or regulations or decree, ruling
      or judgment of any United States or state court applicable to the Company or
      its
      property.

    


    8.
      Indemnification.
      Purchaser hereby agrees to indemnify and hold harmless the Company and the
      Company’s officers, directors, stockholders, employees, agents, and attorneys
      against any and all losses, claims, demands, liabilities and expenses (including
      reasonable legal or other expenses incurred by each such person in connection
      with defending or investigating any such claims or liabilities, whether or
      not
      resulting in any liability to such person or whether incurred by the indemnified
      party in any action or proceeding between the indemnitor and indemnified party
      or between the indemnified party and any third party) to which any such
      indemnified party may become subject, insofar as such losses, claims, demands,
      liabilities and expenses (a) arise out of or are based upon any untrue statement
      or alleged untrue statement of a material fact made by Purchaser and contained
      herein, or (b) arise out of or are based upon any breach by Purchaser of any
      representation, warranty or agreement made by Purchaser contained
      herein.

    


    9.
      Miscellaneous.

    


    (a)
      Notices.
      All notices required or permitted hereunder shall be in writing and shall be
      deemed effectively given: (i) upon personal delivery to the party to be
      notified, (ii) when sent by confirmed facsimile if sent during normal business
      hours of the recipient, and if not during normal business hours of the
      recipient, then on the next business day, (iii) five calendar days after having
      been sent by registered or certified mail, return receipt requested, postage
      prepaid, or (iv) one business day after deposit with a nationally recognized
      overnight courier, specifying next day delivery, with written verification
      of
      receipt. All communications shall be sent to the other party hereto at such
      party’s address hereinafter set forth on the signature page hereof, or at such
      other address as such party may designate by ten days advance written notice
      to
      the other party hereto.

    


    
      
        
        

      

      
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    (b)
      Successors
      and Assigns.
      This Agreement shall inure to the benefit of the successors and assigns of
      the
      Company and, subject to the restrictions on transfer herein set forth, shall
      be
      binding upon Purchaser and Purchaser’s successors and assigns.

    


    (c)
      Attorneys’
      Fees; Specific Performance.
      Purchaser shall reimburse the Company for all costs incurred by the Company
      in
      enforcing the performance of, or protecting its rights under, any part of this
      Agreement, including reasonable costs of investigation and attorneys’
fees.

    


    (d)
      Governing
      Law; Venue.
      This Agreement shall be governed by and construed in accordance with the laws
      of
      the State of Delaware without regard to the principles of conflicts of law
      thereof. The parties agree that any action brought by either party to interpret
      or enforce any provision of this Agreement shall be brought in, and each party
      agrees to, and does hereby, submit to the jurisdiction and venue of, the
      appropriate state or federal court for the district encompassing the Company’s
      principal place of business.

    


    (e)
      Further
      Execution.
      The parties agree to take all such further action(s) as may reasonably be
      necessary to carry out and consummate this Agreement as soon as practicable,
      and
      to take whatever steps may be necessary to obtain any governmental approval
      in
      connection with or otherwise qualify the issuance of the securities that are
      the
      subject of this Agreement.

    


    (f)
      Independent
      Counsel.
      Purchaser acknowledges that this Agreement has been prepared on behalf of the
      Company by Skadden, Arps, Slate, Meagher & Flom LLP, counsel to the Company
      and that Skadden, Arps, Slate, Meagher & Flom LLP does not represent, and is
      not acting on behalf of, Purchaser. Purchaser has been provided with an
      opportunity to consult with Purchaser’s own counsel with respect to this
      Agreement.

    


    (g)
      Entire
      Agreement; Amendment. This
      Agreement constitutes the entire agreement between the parties with respect
      to
      the subject matter hereof and supersedes and merges all prior agreements or
      understandings, whether written or oral. This Agreement may not be amended,
      modified or revoked, in whole or in part, except by an agreement in writing
      signed by each of the parties hereto.

    


    (h)
      Severability.
      If one or more provisions of this Agreement are held to be unenforceable under
      applicable law, the parties agree to renegotiate such provision in good faith.
      In the event that the parties cannot reach a mutually agreeable and enforceable
      replacement for such provision, then (i) such provision shall be excluded from
      this Agreement, (ii) the balance of the Agreement shall be interpreted as if
      such provision were so excluded and (iii) the balance of the Agreement shall
      be
      enforceable in accordance with its terms.

    


    (i)
      Counterparts.
      This
      Agreement may be executed in two or more counterparts, each of which shall
      be
      deemed an original and all of which together shall constitute one instrument.
      This Agreement or any counterpart may be executed via facsimile or electronic
      mail transmission, and any such executed facsimile or electronic mail copy
      shall
      be treated as an original. 

    


    (j)
      Survival.
      The representations and warranties contained herein will survive the delivery
      of, and the payment for, the Securities.

     

     

    (k)
      Waiver
      of Jury Trial.
      Each party hereto hereby irrevocably and unconditionally waives the right to
      a
      trial by jury in any action, suit, counterclaim or other proceeding (whether
      based on contract, tort or otherwise) arising out of, connected with or relating
      to this Agreement, the transactions contemplated hereby, or the actions of
      Purchaser in the negotiation, administration, performance or enforcement hereof.
      

    


    
      
        
        

      

      
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    IN
      WITNESS WHEREOF,
      the parties hereto have executed this Agreement as of the day and year first
      above written.

    


    
      	 	 	COMPANY: 
	 	 	 	 
	 	 	GREENSTREET ACQUISITION
              CORP. 
	 	 	 	 
	
            	 	
              By: 

            	/s/ Jeffrey
              Safchik
	
            	 	
              Name: 

            	
              
Jeffrey
              Safchik
	 	 	
              Title: 

            	Chief
              Financial
              Officer
	 	 	 	 
	 	 	
              Address: 

            


    

     

    
      
        	 	 	PURCHASER: 
	 	 	 	 
	 	 	GRST ACQUISITION,
                LLC 
	 	 	 	 
	
              	 	
                By: 

              	Greenstreet
                Capital, L.P.,
its sole member
	 	 	
              	 


         

        
          	 	 	By: 	
                  Greenstreet
                    Management, Inc.,

                  its
                    general
                    partner

                


        

      

       

      
        
          
            	 	 	 	 
	
                  	 	
                    By: 

                  	/s/ Jeffrey
                    Safchik
	
                  	 	
                    Name: 

                  	
                    
Jeffrey
                    Safchik
	 	 	
                    Title: 

                  	President
                    and
                    Chief Financial Officer
	 	 	 	 
	 	 	
                    Address: