Product review (2 stars): Inaccurate
From a product design standpoint, and price standpoint, this is pretty good. But ultimately it's not very accurate. On hot days, I've seen deltas from this to any other thermometer on the order of 12+ degrees F over temp. The unit is not in direct sunlight, which commonly causes this problem. The indoor thermometer always seems to read a few degrees high as well. In the attached picture, the actual outdoor temp is ~108F, indoor ~74.

Since ultimately accuracy is the biggest component, 2 stars.