Product review (2 stars): Good temp sensor, but RH not so great
The temperature sensor works well and is fairly accurate.  However, the humidity sensor doesn't seem very sensitive.  I've had this on an Arduino logger system for almost a year with plenty of RH changes, and it usually just reads around 41.  The only time I have seen it move was when I tried testing it by putting it in a plastic bag with water in the bottom.  It went up in the 80s.  Maybe I got a bad one?