Instruct: Classify Amazon reviews into positive or negative sentiment
Query: I'm Returning to Mine - Gives me Cramps

If you have mild to severe carpal tunnel syndrome like I do, I would NOT recommend this mouse. It is simply uncomfortable to use. First, it lies too flat to be gripped comfortably. I do NOT have large hands either. In fact, I am a woman with very small hands and I found it simply "too small and thin" to be of comfort. Second, I was getting a cramp in my middle right finger from using the scroll wheel. Again, the design is simply not very ergonomic IMHO. I did like having a programmable 4th button (which is why I wanted to upgrade)but that was really the only improvement I saw. For now, I will stick with my Microsoft Optical Mouse 3000 as it simply is A LOT more comfortable to use. It's a shame that the newer model has a poorer design ! I might have to switch to Logitech VX...