I had one that had a doubleclick problem (single clicking caused doubleclicking). I called them and they sent me another without taking the old one back. I have no idea what version it is, but, it does not have any problems... well except for the fact that if I use the newer intellimouse drivers and connect the mouse to my Hawking 2port KVM Switch, and I scroll in internet explorer it goes back/forward pages automatically when you hit the top/bottom. Does NOT do it with native win98 intellimouse drivers, just the extra software that lets you use the additional buttons and assign tasks.
WinXP must use the newer drivers because the problem happens there as well. Since it only happens with the switchbox installed I don't think it'll be patched--but--it should be capable of being fixed in software since the regular drivers do not cause the problem.
Oh well.