A very useful device. For a long time I chose between it and Razer Ultimate (I have a keyboard from Razer and I wanted to synchronize the backlight between devices). As a result, I chose Logitech, I was not disappointed. Different pros: It fits comfortably in the hand, all buttons are accessible and conveniently located, but there are no accidental clicks, I don’t touch additional buttons by mistake. I especially appreciated the switch between normal and endless scrolling. Super convenient when working with large documents or on large sites. I reassigned the buttons to my needs, now I have a computer control panel in my hand. No need to move the cursor around the screen again. The presence of additional weights in the kit, which can balance the mouse. I made it harder, because. I don't feel light mice in my hand. Nice futuristic design. Holds a charge for a long time. You don't have to charge every day. If you forgot to charge and the mouse is cut off, it is possible to work like a regular wired mouse while it is charging. Cons below: I don’t understand why when going to sleep mode, the backlight turns on, which is turned off in the work mode to save battery. Of course, illumination in idle time puts a charge. In the software settings, I did not find how to manage it. And every time turn off / turn on the button, well, like that. Micro USB charging port. For me, this is not such a big minus, but type C would be more versatile.