Say hello to carpal tunnel!
I was going to get this mouse:
Until my doctor advised against it. He said most of his patients that have symptoms of carpal tunnel and work with a computer all day often are using a wireless mouse. Because the batteries are much heavier than a wired mouse it stretches the tendons harder and pulls the nerves against the wall of the carpal tunnel. He suggested finding the lightest wired mouse I can find and he did say the design of this mouse was good (except for the batteries).
So anyone know of a wired mouse like this one?