Well I bought the mx1000 the other day and I'm returning it today, the thing is rubbish, and I should have known it a) because it's logitech, and b) it's wireless.
To make it worse it has this jumping wierdness where periodically it will jump to the top of the screen every minute or so making the thing damn near useless. This of course can be fixed by putting your expensive usb mouse into the ps2 port....
I bought one of the original logitech wireless opticals and it was terrible. The Mx1000 is a marked improvement on that, but it's heavy, and despite the laser technology, it feels far less precise than my old intellimouse explorer 4.
Now I loved the Intelli Exp 3, but microsoft can't leave a good device alone and ruined it with the 4.0 so now I'm in a drama. I know I don't want a wireless brick.
So what mouse, I like light above all else, I don't mind cords, I don't care if there's only three buttons and a scroll wheel, just as long as it works in linux and windows, is accurate and light I'm keen.
The MX1000 so doesn't meet the above needs, and that's what I get for buying on a whim