Summary: I actually sent mine back because it was too hard to get used to. Also, I would recommend the wired one as opposed to the wireless one, because you would have to always remember to charge the batteries or replace them. I think the product is good in general, but didn't work for me.
Summary: This 3M product is GREAT in concept. The handle is comfortable, the movement crisp, and the reality is - it virtually eliminated my wrist pain from using a mouse all day long. The only 2 problems are - 1. there's no "roller" wheel for scrolling up/down on web pages - a virtual necessity in today's web world. 2. the mouse button on top is built too weakly. I only had the product for a few weeks and I was very gentle with my clicking all day.