Well, just got the Performance MX, and it's quite nice.
First impressions.
1. Changeable rechargeable battery is back. That was one of my major beefs with the MX Revolution. It takes one standard rechargeable AA battery.
2. Sensitivity is higher than the MX Revolution. Setting mouse speed 2 notches down exactly matches how the Revolution felt for me.
3. No automatic flywheel - click mode as suspected.
And the button to manually change the function feels a bit flimsy.
4. AMAZINGLY, tracks perfectly on a clear glass desk. I have no idea how it's doing this. First thing you'll note is that it doesn't use traditional mouse "laser" and CCD to do tracking. If you put your hand under it, there is no visible light.
Tracks just as well on perfectly clear glass (with nothing under it) as it does on a gaming mouse board.
5. Miss the side wheel that the MX Revolution has.
6. Can use it right out of the box while it charges using the USB charging cable. Having a cord still annoys me however, but at least I can live with just one mouse again.
[edit] Not sure if the cable is even going to be an option for me. Reminding me all the time why I absolutely HATE cables on mice. Constantly snagging on the desk (friction), edge of mousepad, pens, monitor stand, edge of desk, etc...argh.
Also, not sure how long it takes for the mouse to go to sleep/standby mode, but once it does, it takes a fraction of a second to come out of it. Very noticeable compared to the MX Revolution when I step away to make something to eat and come back a couple mins later. Hasn't entered standby while in use, thankfully.
Gah, went into standy while I was typing this update. So maybe a minute or two minutes?
Regards,
SB