I got 'em in the GSX and love 'em. I found all kinds of stuff likes to rattle loose, and it takes a lot of loctite to keep the car together after you install them... but my girlfriend likes the way it vibrates. I'm not trying to sound like a perv or anything, but she digs it as much as I do. The car feels like it's... more serious. You'll get used to it fast. Using electrical tape on dash fasteners, screw heads, etc... can help you sort out all the buzzes and rattles.

DSMers with solid poly motor mounts (and no balance shafts) have been known to vibrate their oil filters loose. That's a nightmare.