To replace a Logitech Mouse MX 600 which has many served and the end of life, the Logitech Performance MX is a continuation: multi-function, careful manufacture and desing are waiting for you. The "free wheel" is more pleasant to use and overall ergonomics of this mouse is very good and well thought out, with "slides" perfect obtained thanks to its 3 wide skids and weight that suits me perfectly Just a little flat on the "zoom" key is misplaced (in my opinion) below the keys "back front and rear", forcing the thumb up and that we can confuse the use and be annoying early Use: after you get done without too many problems ... This button "zoom" not putting very useful, I preferred the reconditioned adjusting pointer precision (IPR) and it's perfect for me. I did not test the durability of the battery or its frequency, not having enough back in time for its use. The mouse is accompanied by an elegant black kit with included: USB charger, USB charging cord and USB extension on which connects the "Unifying" receptor for desktop PC users. Everything, well packaged in a beautiful box, seems to me well made and breathes Logitech quality. Delivery by Amazon within the time and in perfect condition in proper packaging. Great!