As my old mouse gave up the ghost, I went in search of a new one. In a well-known electronic market, I could take this mouse in my hands and was convinced. It is not covered with ludicrous many keys and fits comfortably in your hand. Especially addressed me the design and the ribbed surface on the left side. All buttons are within easy reach and the mouse can be guided easily. A special gimmick is the applicable bracket, which can accommodate several small weights of 1.5 and 4.5 grams. So you can adjust the mouse ideal. The cable is not too stiff and has a sufficient length. The software that you can still download Logitech itself is great and easy to use. For example, the mouse can be adjusted exactly to your taste. The "buzzing", which was often addressed here, but only you can hear when you close keeps the mouse's ear and know this is a buzzing there. Otherwise I hear in use absolutely nothing, and I have no bad ears. I need professional reasons each year make a hearing test and there it always with flying colors. Delivery and packaging, as always impeccable. All in all, this is a very good mouse. I can wholeheartedly recommend. I generally recommend but each to take the mouse before buying into their own hands, for example, in retail.