Do you prefer to use the mouse or the keyboard for you audiosurfing?
Or even both if you enjoy the double car ones!
Personally I prefer the mouse, because I find the keyboard difficult to use. Although, with the mouse I sometimes struggle to get the blocks in the middle lane.
Mouse all the way, with mouse you can ride in between the lanes hitting the side of blocks and just generally staying more mobile, I can't stand using the keys.
mono is for lazy people. In any case, it's clear that mouse is the way to go... the simple task of getting across the screen to the other side is difficult with keys.
I just hate that S/D are "spring-loaded", I can't get used to that. I like to use them on those pesky blocks that hide in front/behind of greys -- though I just spread the fins if possible.