I love Logitech. True, before that there was g403, which flew to the mouse paradise after only six months. There was a marriage of the wheel and no fraud with the software helped. A very common problem with g403 I took to replace g502, which I considered earlier. The model is great. Much nicer to hold in your hand, even though the mice are in the same price range. Davis with a capital letter. Lives for a year and no problems. Everything is working properly.