This is my favorite mouse for several reasons. Firstly, it lasts through lots and lots of gaming as well as enduring random (unintentional) abuse. The keys are easy to program, the shape is extremely comfortable and its well designed for smaller hands. The three different settings for the buttons are easy to flip through and the mouse wheel doesn't get stuck. I've purchased two of these beauties (the first one died after some years of use), and I'll keep buying them as long as they're still available.
Additionally, I've had no problems at all with the refurbished one I bought from Amazon. It came out of the package in pristine condition and worked as soon as I plugged it in.
Logitech G300s Optical Gaming Mouse