Product review (2 stars): good product until is stopped working
In terms of functionality this is an interesting product and I would have given it 4 stars aside from one point - it stopped working. Two stars is a compromise.  When I originally received it, it was easy to set up and did exactly what it said it would do.  One reviewer noted the lack of a back-lite screen and I agree, it would be nice.  The external sensor was placed in a protected area in our front porch, no direct sun and dry, it was on the wall about 5 feet above the floor.

Everything was fine for a couple of weeks until it said the outdoor temperature was 158 F (December 2015 in Massachusetts).  There was no fire.  The indoor temp was accurate.  This may have been a one-off issue or just poor quality control, but I decided to get a refund.