Existing users, 
Just a fair warning--I upgraded to version 2.1 this morning, but it rendered my mouse slow-as-molasses! I checked the Apple and logitech preferences, and all was correct, but my mouse kept dragging. I re-installed 2.0, and all is right with the world again. My mouse couldn't be zippier.
I've always been happy with Logitech's drivers, but be careful on version 2.1. Keep version 2.0 on standby in case you run into similar problems. Of course I like a fast mouse, maybe most won't know (or notice) a differrence.
--Swordman
Logitech Control Center
For their USB mice & keyboards.
Version: 3.1
2.0 Great, 2.1 BEWARE
Feedback Type: Troubleshooting Report
Contributed by: Swordman Friday, August 25 2006 @ 05:12 AM PDT
Product Platform: MacOSX
Used Product For: Over One Year
Recommend Product: YES
System Info:G4 MDD 1.25GHz (single), Aplpe keyboard, Logitech Optical mouse with scrollwheel.
Comments
Fix for - 2.0 Great, 2.1 BEWARE - Swordman
Hey Craig, Swordman here--I tried your tip, and it works--at least in 2.0. I'll try re-installing 2.1 now and see. Thanks for the great tip. I agree, why would they hide such a great tip?
The one strange thing though--it already was on 1x in version 2.0. I suppose I'll have to up it in 2.1 then, as it did slow my mouse to a crawl last time.
Again, GREAT TIP!
Tuesday, August 29 2006 @ 01:18 AM PDT
Fix for - 2.0 Great, 2.1 BEWARE - ccrossman
Hey Swordman (and all),Evidently installing 2.1 resets the speed modifier variable. But it's easy to adjust! Don't know why Logitech conceals it like this but once you know about it, it's right there. Give this a try: Just right click on the image of the mouse in the System Preference pane after you select the Logitech preference. This is BEFORE you click on the "Configure" button! You will see a Speed "Modifier" menu appear! Move over it and a hierarchal menu of speed modifiers will appear! Yours is probably reset to 1X with a checkmark next to it. Just select 2X or 4X and your mouse will be a zippier as ever! :)
Craig
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Friday, August 25 2006 @ 07:52 AM PDT