I have the cheap logitech 5.1 setup (z640, I think).
Actually, I don't have an audio setup in my room anymore (granted, it was only a cheap, badly setup, 2.0 system). I never used it.
I've thought of getting a proper 5.1+ setup for my room, but I don't watch tv often enough and it'd be a PITA to run the cables (my tv is wall mounted on one side of the room, my electronics are on the other side of the room, next to my bed). Hell, I've had a DVD player since Christmas and I've never hooked it up. The coaxial tap comes straight from the splitter in the attic, and a line of coax was run through the wall so I could hook up my VCR (which I haven't used in years).
edit: the way the cables were run is actually pretty slick, but it really limits the way the furniture in my room can be configured.