Pros: The configuration utility is usable, if not exactly a pleasant experience. It gets the job done and I appreciate the 5 settings for DPI. Button features: overall they always did what I needed them to do. Again, not a super great UI. I've had this since 2010 as my main mouse. I am writing this review and then purchasing another one of these at twice what I paid for it 5 years ago! If it wasn't an undeniably great mouse, I would not buy it again.

Cons: Only in the last week has the cursor started acting up and it gets stuck moving the cursor in a straight line and I have to jiggle the settings and buttons to unfreeze the cursor. Seems to be getting worse, hence why I am buying a replacement.

Ordered a fan/heatsink from Newegg, but didn't order a new CPU. Once I got the heatsink, I decided to order a CPU - I expected to have to wait a week or more, but the delivery was super fast from ANT Online and I was able to get it all up and running much faster than I expected. Thanks!