So I've heard--and although newer Macs have BT 2.1 (which has more reliable initial connections, supposedly--who knows about lag) my main gaming Mac only has 2.0. And I've never noticed a lag problem with my Mighty Mouse.
Which isn't to say the problem isn't there--I just can't notice it. Or maybe I set my mouse speed differently in a way that helps?
I do want to avoid lag, noticed or not, and if the mouse is chosen JUST for gaming I might prefer wired for that reason.
Looking at the
Logitech MX Revolution, I really like the features--Plenty of buttons and six scroll axes! Enough for me to play Quake Wars keyboard-free. And it's supported by ControllerMate (and officially supported on Mac by Logitech too). I have a few questions to ask in the ControllerMate forums about it (without drivers, are the wheels clicky the way I like?) but it's my top choice now--despite being RF. (Batteries to worry about AND a USB port wasted!) I wish I could find a good name-brand WIRED mouse with a similar number of programmable functions.
I hadn't heard anything about lag with RF mice--that's a good question to look into.