content: Very convenient mouse. Why would you want to move your wrist/arm when you can do it all, and more precisely, with your thumb? The scroll wheel doubles as zoom in games like Spore. Ball rolls smoothly on three jeweled? bearings. Easy to clean with a few wipes of a cue tip. MTBF of the button microswitches based on my experience is several years. (error in "stars" rating. I rated 4 or 5 stars on all categories)