I just want to say how much I have loved my RollerMouse. It truly saved my wrists as I was building very large spread sheets at the time I got it. The constant mousing was taking its toll on my wrists. Also, with a regular mouse you start to move the arm further and further away from the body; thus the forearm and elbow starts to hurt. The RollerMouse has been the perfect solution. When my job was outsourced, the company gave me the RollerMouse, and it has followed me every where I gone! I still love it as much as the day I first got it.