content: It took about a year but it finally gave me carpal tunnel syndrome in both arms and hands. The exposé feature is really bad for that problem. I moved back to aLogitech Optical Marble Mouse (USB/PS2)I once used for a while after buying aLogitech Trackman Wheel Opticalwhich didn't help. But after a few months using that trackball, the carpal tunnel returned so I'm now back to limited use of a Mighty Mouse, trying to use more of Tiger Keyboard Shortcuts and the Universal Access Mouse Keys feature.