I burned through 2 of these MX518's, the first one I bought and the replacement the company sent. It took about three months apiece. They work great to start but if you have anything but a soft touch they can't take it. And I don't mean abuse-Just serious use. If you advertise yourself as a GAMING mouse...HELLO-you'd better be able to handle serious gaming. I'm not even going to go through the hassle of trying to get ANOTHER replacement. If I had it to do all over again I'd start with another brand!