Overall impressions are 3/5, but the switchable backlight is very important to me, so I don't regret buying it. Do not count on the reliability of the buttons. Has some pros: Switchable backlight, comfortable 4/5 shape, pleasant coverage. Has cons: The buttons are too soft, pressed from the weight of the fingers. The wheel began to loosen very quickly. Double clicks appeared after a year with little use. The coating on the left button has worn off over time. The DPI button protrudes too much and is sometimes pressed accidentally when working with the roller (pressing the roller).