buffboy,
i've had this combo for quite some time and am fairly satisfied. the batteries last surprisingly long.. about 3 months for the mouse (2xAAA) and 5-6months for the keyboard (2xAA). the range is great, about 20ft or more (i never did a clear line of sight, just out my bedroom and into the hallway).
as for the gaming, i'd give this a negative. the mouse is not as ergonomic as i'd like it to be (especially for 100bucks), and the buttons and scroll arent soft and smooth as a microsoft mouse - a little too much click. the worst part is that it only clocks in at 60hz, even using ps2rate etc. you can adjust the sensitivity in the games, but its just a little disappointing for us gamers. i wonder if the battery life would be decreased if someone was to release a util to tweak it?
as for the keyboard, the only things i would have liked were softer keys and maybe a few more shortcut buttons. otherwise, its great and at a decent weight. everything works in win2k well too (except maybe the sleep button).
final thoughts - decent for any non-gamer if you can manage a deal. i'd look into the ms cordless for mouse comfort. dont know how the logitech pro feels tho. if you're wondering why i settled for this combo, well i got a GREAT deal (thanks VA!), im not that much of a hardcore gamer, and i wanted the cordless ability to game and watch dvd/divx on the tv. hope this helps!