Excellent! Takes a little bit of time to get used to it, but its amazing!

Don't underestimate this funny looking mouse. It's just a regular mouse that you hold vertically and manipulate left and right buttons with your thumb on a rocker switch instead of fingers on buttons.

I have been using this 3M ergonomic mouse for past 3 weeks now and I am pretty impressed that the pain in my arm and wrist that has been there since 6 mos because of herniated disc in my neck has almost gone.

I was excited to find a 'joystick' mouse, to relieve my clicking-finger stress-even such a tiny movement repeated all day causes stress up to my shoulder. I hoped holding my hand in one place and moving it like a joystick would be different, but that's not how it works.

the mouse click is great as you don't have to move your fingers as it is done with the thumb, but the ease of moving the mouse on any surface is not as good as it could be. The scroll feature is placed great and works well. I would recommend this product even with it's small flaw.

I work on a computer all day and my wrist was starting to hurt more and more. Within a week of getting this mouse the pain was gone. It takes a little getting used to, so don't expect to be comfortable on it for the first week or two.

Ive been using this mouse for years. I write a great deal in my work, so this has saved my wrist. My only complaint is that they only seem to last less than a year before I have to replace. That kind of planned obsolescence isnt cool.