I have the mouse recently in test mode for CAD applications. The Ergonomics and is super, they awarded me is in his hands. Class I find that there is a "real" middle mouse button, in addition to the wheel "button". All keys are very smooth, apart from the bottom. The proceeds slightly heavier because you always something on it is by hand. The only real drawback: it is slightly inaccurate compared to Logitech MX518 or Sharkoon Drakonia. So I'll keep my old MX518 still there can parallel. It is nevertheless very relaxing when you can change and the hand times the attitude changes.
