Review on Enhanced Comfort and Precision: Wireless Ergonomic Mouse for Right Hand (Medium) by Brad Fleming

Although it takes some getting used to and the wrist hurts at first. I find the mouse to be quite comfortable, especially for those of us who have tried vertical mice before and didn't find them to our liking. However, the battery life of this thing is terrible. It's not even enough for a full 8 hour work day - despite the fact that we tried different battery brands - both rechargeable and brand new alkaline. If a wired one comes out, I'd be very happy to buy it. But unfortunately this one is back.