Summary: Although I don't suffer from carpal tunnel, my elbow can sometimes get sore when I pull crazy hours at the computer since my job requires me to use the mouse in excess and mostly for fine operations. I got this mouse to try and alleviate that problem somewhat. In that, it's successful. it changes the position of your hand and arm to a more natural one, and lets you use your forearm for movement without stress on your wrist.
Summary: I purchased one for work and after a year or so I had to have one for home. I knit all the time and want to take care of my hands. Make sure you get the right size. I had the large one for a short time and the reach for the thumb was not natural. Otherwise once you get used to clicking the correct side of the button it is smooth and I have very little hand fatigue.
Summary: I love this product. I only have a couple of suggestions for 3M. I have such a hard time with a mouse. I have early CT in my wrist but my job is on the computer. I also have very small hands. I got the smallest one they offered though it is still a bit too big. I also thought it would move like a joy stick instead of a mouse. I wish the base pad were thinner. Those are the only negatives I have to say,
It is a wonderful piece of ergodynamics.