I had an MX1000 before i bought this MX Revolution. Now that was a decent mouse. The MX Revolution is just an annoying rodent if you ask me. The buttons are too sensitive, not placed very well, that special scrolling wheel is more or less ok (sometimes it goes into free scrolling by itself), but i haven't really found any decent use for it (except if you work with 10000 row excell sheets all the time), ...
Now that's my opinion about the hardware ... the Logitech software is just simply the biggest piece of cr*p i've used on any mac, ever. They removed unsanity's APE in the new version but a whole slew of problems are caused because of this software.
The Dock becomes unresponsive, mouse doesn't get recognized, won't wake from sleep, kernel panics when waking from sleep, ... That's just what i have experienced. Take a look at forums.logitech.com it's simply unbelievable that a company like that has such crappy mac-support.
If you want to use their products without worrying about problems, a 3rd party controller like SteerMouse of USBOverdrive is no luxury. But why would you want to buy a mouse and pay for 3rd party software to get it to work properly.
The MX1000 had the same or even worse software problems, but at least the hardware was worth the price.