Well I can tell you the Laser mouse is a pretty good mouse. The only issue I have with it is that the battery is internal (lithium) so I have to keep a back up if the mouse goes out and I'm in the middle of something I dont want to put down yet. The battery's charge holds pretty well though. Just wish I had the ablitiy to swap batteries instead of waiting for it to charge for 3 hours (or so).

And I dont notice any appreciable lag when playing FPS games, unlike some of the MS wireless mice I have used in the past.