Summary: I used one of these I bought years ago until it died (I dropped it too many times!), so this is my second unit. I love the fact that it minimizes wrist & finger fatigue. What I don't like is it takes a bit of concentration to make sure your left click is an actual left click, an issue I don't recall having with my first one. Also, the front button which replaces the scroll wheel doesn't seem to work on this one, either.
Summary: I purchased this product on the recommendation of my physical therapist, since traditional mousing was aggravating my "tennis elbow" significantly. It provided immediate relief while mousing. I have used it for about 3 weeks with no problem, other than the learning curve associated with buttons being located in different places than I was used to. I have not experienced the problems that I've read in some reviews (so far).
Summary: This is the second of its kind that I have bought (one for home and one for work). Using a regular mouse aggravated my carpal tunnel so much that I was unable to be on the computer for more than a few minutes at a time. While I still have problems, they are not longer brought on or aggravated by using a mouse.
Summary: This stick mouse takes a little getting use to but it works great to take the stress off your pointer and index finger you usually use to click the mouse. This is the second 3M stick mouse I've owned. First one was wired (wireless was not available at the time). First one lasted approx. 5 years, right click button wore out. Not bad, I used it for work, 40 - 50 hours per week. New stick mouse is wireless, no trouble setting it up, commented automatically, no issues.
Summary: I just bought my 3rd one of these, and that says it all. The 1st two broke; the part where the vertical handle joins the base is narrow, which makes it too weak so it snapped there twice. However, it was so good for my wrist that I figure it's worth the price to buy a new one every year. I tried another widely-sold ergonomic mouse, but it wasn't as good for my wrist, and anyway it broke too. Maybe I'm just hard on mice.
Summary: The grip seems nice and moves very smooth, but the battery life SUCKS. You will have to remember to turn the switch OFF at the back if you are not using it. It cannot be compared to the Mac wireless mouse.I find you cannot scroll down with ease like the Mac mouse. Many function not available. I thought this wold help me with Carpel Tunnel, but WASTED my MONEY. I consider this another DONATION to AMAZON CHARITY.