Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Complex, flimsy, unstable

Bought this with high hopes because of its compact design and supposedly good features - BUT: 1) The setup is very long and tedious. And if you don't complete it the moment you change batteries, it's very difficult to do so later. 2) The buttons have all the tactile feedback of a pencil eraser. They are almost impossible to operate. Very poor quality. 3) The darn thing keeps falling off! And every time it falls off, the battery pops out and it forgets everything, of course, and so it demands that you go through the tedious setup again. Basically, I have never bought anything Made In China by Oregon Scientific and NOT been bitterly disappointed.