I bought it to replace the Evoluent VM4R (wired) after 11 years, just because I got tired of seeing it every day. The old one stayed at the office.
The new one is bigger, just as I wanted. It comes in 3 sizes instead of the 2 that the old one had. Very lightweight even though it's wireless and has good response.

Very satisfied with both Evoluent mice, very comfortable and ergonomic. All the pain problems I had (since the first one, 11 years ago) have stopped.

It takes a little time for the body to get used to it. Stick to it at the beginning and then it will be very comfortable.