I'm not saying this is a bad mouse, it's a great one, that allows precise tracking and greater comfort than the vast majority of the market.

I've been using these for about 14 years now, dating back to when it came in beige and only had a PS/2 interface on it (modern versions are silver and USB, with a PS/2 adapter included if you need it).

Not a great product! There is no scroll wheel and the placement of the buttons is not at all comfortable for either short term or long use.