Instruct: Classify Amazon reviews into positive or negative sentiment
Query: uncomfortable.

This mouse works well and is affordable. However, I would not recommend this mouse if you spend an extensive amount of time surfing the internet, gaming, or working in various mouse-intensive applications. I got this mouse a couple months ago at my workplace and it's simply uncomfortable after extended use. I find logitech's designs or microsoft's right-handed designs to be far more ergonomic. In fact, I have switched back to a track ball logitech as my primary mouse at work due to the repetative stress that had been effecting my hand.