In general, the impressions from the mouse are good, I really like the ergonomics, but the wheel spoils the impression very much. With its pros: Ergonomics, tactile sensations, operating time from 2 batteries - more than a year in energy-efficient mode (I rarely play). Ability to reconfigure keys. No glitches / lags for more than a year. Got cons: When pressed, the wheel began to give a double click, I use pressing the wheel all the time (development environments, browser) - double click is very annoying.