I did not reveal any critical problems in the operation of the mouse, an excellent choice for a quiet mobile mouse. Some pros: she's quiet, really. Even the wheel click, which is a problem with quiet mice, is very quiet. Previously, I used a wired quiet mouse for silence, so the wheel clicked so that all the advantages faded. And I have to click the wheel very often. So this mouse allows you to work comfortably without disturbing anyone around. As far as I can judge, energy saving is also on top. According to the manufacturer, it can automatically turn off when not in use. According to friends, it can work for years on one battery. Let's check :) Cons: The mouse is a bit small for me, although for a mobile mouse this is normal. The move is unusual, acceleration and deceleration of the cursor during movement are unusual after m185 and wired mice. Perhaps a habit or settings in the OS. The cover under the arm that hides the battery and the USB connector in my version does not fit tightly enough, sometimes you can hear a rattling sound during sudden movements.