Bests & Worsts Reviews from Amazon

I have used this product for YEARS. I have one for every computer. 20 years back i developed repetitive strain injury on my right wrist from too much mouse work. I did two steps to correct. First I learned to "mouse" with my left hand. Second, I tried a bunch of "alternative mouse" products. In my opinion the Marble Mouse is the best! In my engineering job (which is computer intensive) I never developed wrist problems on my left wrist. Two comments: 1. every month or so i notice the ball has a small bit of resistance. I pull the ball out and pull lint off of the white "balls" which the track ball sits. It takes 10 seconds 2. I found a magic cure for my right arm: vibrating heating pad. I put big rubber bands around it so it wraps around my wrist. I massage my arm while I watch TV.