Product review (2 stars): Don't know if I like it because Amazon Home Services left me hanging!!!
I don't know if I like this or not because at checkout I chose Amazon Home Service for installation.  I was hesitant to do so but all of my Amazon experiences have been positive so I figured that they use contractors and installation professionals that have proven to be reliable, properly insured, etc.  I was asked at checkout if this was replacing an existing vent hood or was this a brand new installation requiring duct work to be run.  I chose "brand new installation" as my prior over the range microwave was recirculating only, not ducted to the outside.
My install was scheduled for a Friday.  I took the day off work.  As the end of the appointment window drew near and still no contractor, the contractor called to say that they would be late.  She also asked if the crew would have access to the attic.  I explained that I live in a two story house, the ductwork wouldn't be run through the attic, it would have to be vented out the side of the house.  Three hours later she called back to say they would have to reschedule for the next day at 9:00 am.  On Saturday I cancelled two other personal appointments so that I could wait for the contractor.  When they showed up they were very confused that there was no duct.  They called their supervisor, the same woman I had three conversations with already, and put me on the phone with her.  She said that they could not do the work because there was no duct and running a duct required a permit.  I asked her if they could pull a permit on Monday and reschedule and she said no, the homeowner is supposed to get the permit ahead of time and they don't pull permits.  I asked her if I got a permit would they come back and she said no, they don't do permit work. I told her that in all the work I have ever had done to my house, I had never been asked by a contractor to pull my own permit.  We ended the conversation.  I jumped online to my City's website and they don't require a permit.  The website also stated they only issue permits to the contractor performing the work, not to homeowners unless the homeowner was completing the work themselves.  I looked at several neighboring city's websites and they said much the same.  So apparently this contractor doesn't really know what they are talking about or what they are doing.  I assumed that Amazon would have vetted the contractors they use.  I cannot believe that Amazon is letting their brand be tarnished by incompetent contractors.  For all I know this contractor isn't even properly insured.  NEVER NEVER NEVER again will I trust Amazon Home Services and I will tell everyone to steer clear.  I'm currently looking for a contractor and if push comes to shove, I will buy a six inch hole saw and do it myself.