For normal-sized hands and the daily hourly use the mouse is a bit too small, so you can keep them only with a slightly cramped hand. Front, where any other mouse is rounded down, this mouse is cut off, so to speak - although it looks nice, but does exactly the one centimeter would be necessary for a comfortable hand position. On the go, it is however just right.
The the scroll function, with which you can back in browsers Before / functions without additional software and is so handy that you can get used the "gestures" in one day. For left-handed mouse is equally suitable for right-handers.
Conclusion: The perfect mouse with not quite perfect ergonomics