Good idea, but could do better.

For starters, the mouse has a fabriquation far from quality. I may be wrong fallen, but the one I received was not "flat". On a soft surface such as a thigh, a sofa or a thick mouse pad and cloth, it is not a drama, but used on a hard surface (what was the intended use in my case), the mouse is wobbly, and it quickly becomes annoying.

Second major default, the buttons are hard, especially that of the dial. Clicks still spend if we firmly holds the mouse (you still have to put more strength in the fingers than with a standard mouse), but can not use the wheel button without moving the mouse, causing potentially ( often include in my case) to click next, virtually making impossible any precision work. The fact of having to cramponer mouse also removes all the interest of ergonomics, since it just replaces fatigue by another ...

Because yes, despite this defect, I have never had such a natural grip with a mouse. Ergonomics is just perfect.

In the end, it's a return for me, but less demanding users, or simply spending less time with a mouse in hand probably find their happiness.