I jumped in the optical mice movement with a logitech wheelmouse optical. I tought it was a pretty good mice, confortable and accurate. However, last month the wheel started not working proprely so I got pissed and bought one of these MS intelimouse optical. Much better in my opinion, as it's on better with confort (for my hand anyway ) , It have 2 more buttons ( very useful ), not forgetting the working wheel 😛, plus a MUCH better optical sensor. It really makes a difference with very fast moves in games notably where the logitech would do some erratic moves but my MS stays sharp. So kudos for microsoft who can do some serious mouses
cya