Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Horrible ergonomics

I can't stand the feel of this mouse. It's so long and flat that it doesn't fit into the natural curvature of the hand's resting position. If you're an NBA basketball player with gorilla hands it will be a perfect fit. The thumb and pinky grooves are too rigid forcing you to keep wrist parallel to desk, not angled up as usual. Precision is decent, not great and buttons response is inconsistent. I'm returning this mouse in favor of a Microsoft "egg" shape mouse. For the price, this mouse should be wireless as well...