Really good mouse, with minimal time to get used to the side keys. If not for one BUT. My g13 key does not work correctly, in order for it to work, you need to apply three times more effort than to other keys. Naturally, this is very uncomfortable, I hoped that Logitech products would be less defective =\ I add - I passed the mouse, and bought another one, already in a different place, I came home and . this wheel sticks when you press it to the right =) Again to the store, I think I'll try one more, last time. I ask you to exchange it, there are no black ones, okay, I say, let's get a white one, I come home, and lo and behold, the mouse turned out to be normal, there were no complaints about a single key, though now I'm already waiting for a catch. In short, in my case at Logitech, only the 3rd mouse turned out to be working.