I've been using this mouse for almost a year on my Mac Mini and it has been excellent. One minor issue is that I have to move the mouse before it will connect during system boot up. Apart from that I have had no connection problems at all. It has been rock solid all the time. I use Eneloops which last maybe 6 or 8 weeks with the mouse left on all the time (I've never measured it). The two batteries make it a little heavy, but that is OK for me. Tracking has also been great. I recommend it.