I bought this a couple of months ago and like it a lot. I use it primarily with my left hand, which I trained myself to mouse with in order to reduce RSI in my right hand. While there have been trackballs with scroll wheels, most had been for the right hand only, and past Kensington trackballs with the scroll rings were very expensive and larger. I find this to be both a good size and price, and I enjoy the scroll ring more than most scroll wheels even.