Love (d) mine too -- but just stopped working. Came on here to try to figure out why. Had been using wired...then all lights off...just dead...tried different USB ports...tried wireless...nothing working....
Fiddled around a bit -- now it's working again. Could really use a faq or troubleshooting guide for this mouse. AND I get a server error whenever I try to go to the registration page...so haven't been able to register it.