Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great for the first two weeks

I got 2 of these, one for office use and one for home use. I do some gaming at home, in the office it's just used for day to day work. Within a couple of weeks both of these started curling up on the bottom edge (where you hand actually rests) and basically became unuseable. Any time you need to move the mouse lower or closer to yourself, you end up running it up a bump, at which point it loses it's normal flat stance and the laser sensor stops working. Both were thrown out within a month of use.