Product review (5 stars): Extremely versitile for fermentation control
I got the Single stage for a Kegerator and I liked it so much, I got a dual for my Fermentation freezer (Fermenterator?).  You should have a basic knowledge of wiring.  The PCB is marked clearly and in 5 seconds I knew how to wire it.  I do think a wiring diagram should come with it just in case you can't read English.  But, you can download it in 20 seconds from their website.  Just make sure all black wires go to the correct slot on the controller.

So, this is the set up:  I will have the controller going into a box with a 120V plug.  I cut the tab on the 120v plug and wired the top to HEAT and the bottom to COOL.  I then will connect the freezer to COOL and place a small ceramic heater in the freezer during winter.  Each HST (High Set Point) is separate, so you can control one plug or the other and not interfere with operation.

The menu system is very complete and has options that $100 controllers don't have.  My favorite is SYNC where it shuts down for 5 mins if there is an outage.  This prevents over-cycling of the compressor and could save you all kinds of money if there is a power bump.

There are a few issues I have that are minor:  The lead for the sensor is too short for me.  That is easy to fix as any 20 gauge wire can be used.  The second thing is there is only one power supply pop-out.  I would have liked one on the side and on the top so you could hook this into any configuration.  Lastly, the PCB won't pull out which would be nice because it's a tight fit to get the wires in.  These are minor issues.  )I may be able to punch a 1/2" hole in the top and use a conduit for an outlet.)

If you have just a kegerator, I think the Single Stage is good enough and with one extension cord, you can make this box do it all.

I really think this is a super product for the price.  When my build is done, I will post more photos.  Brew Strong!