Summary: It does nicely what it is supposed to do. You need to get accustomed to how it works (pretty easy in the end) and to the inexperienced weight on the finger while typing, but after that I really enjoyed using it. It's perfect for daily relaxed use. i.e. thinking to use this kind of devices for photoshop or CAD is bad idea in the first place, not a flaw of the device.
Summary: Not a good battery at all. On the other hand...a super idea and a good implementation of the idea. I enjoyed using it, most definitely, since it was a great change from using a standard mouse or trackball. Not sure if I will chance a purchase of the Ring Mouse again though, since the battery was utterly horrible and it Can't be replaced. Sorry.
Summary: When I'm traveling in the car or on a plane, I have such a hard time with the touch pad and, of course, you have no surface for a regular mouse. I've even tried track balls and still get a lot of stutter. This was just the solution I was trying to find. The flexible rubber ring is soft enough to be adequately comfortable. It is about a size 9, and my index finger is about a 13. So I would like it to be just a little less snug.
Summary: First purchase on 3/25/2014. Had to get a replacement on 4/17/2014 since the battery kept on dying in less than 1 hour. Two months later, now it dies in a matter of minutes after a full charge. Now I need another product (not a replacement of this product) that actually works...