I have a Logitech MX Revolution! Bought it in 2009, and it's still going well! Quite worn now, the thumbwheel is worn almost smooth, and the rubbery coating on the right hand side is almost worn off, but it's great. Doesn't hurt my hand after 8 hours of use!
Is looking a bit sorry for itself now though, so I bought a new battery and new skid pads for it, and plan to take it home soon and strip it down, clean out 8 years of gunk from it and service it, ready for another 8 years of use...
The USB reciever is not great though, it looses connection if you move it which isn't a huge issue, but alightly annoying as you can't buy them anymore! I did look at the current crop of Revolution mice, but they don't quite seem to do it for me, the thumb wheel is great, as working in Excel alot I have it mapped to copy, paste and paste special values, the top search button mapped to bring up outlook, browser forward to bring up firefox and the browser back button left as is. The newer ones also seem to not have the hybrid scroll, which I use alot on massive spreadsheets!
Will post some pictures of it during the refurb if anyone wants?