Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Built like a tank.

I've used the Expert Mouse, daily, for at least eight years. Computer systems have come and gone, but the Expert Mouse endures. Calling it rugged doesn't begin to do it justice. I originally purchased this unit for computer graphics applications. The very large ball and stable base give the user precise control over cursor movement. And for games...it's speed and responsiveness are unbeatable. My first Expert Mouse developed a problem with the cable socket. Kensington replaced the entire unit, free of charge and no questions asked. The replacement has endured seven solid years of hard usage. The Mouseworks configuration software is a real bonus. Overall, the Expert Mouse is one of the better hardware investments you could possibly make.