went for a test drive today in the only rs4 demo car in aus.
Its a bit like an m5 in that its a piece of cake to drive normally and goes quite hard, then you press "S" and it gets a little gruff. It pulls like a train in any gear all the way up to redline. 0-100 took all of "fu(k me that was fast, oh crap we're doing 160!"
The brakes on it are another thing, the brake peddal is stepped so that it is closer to the driver than the go fast peddal, so when you stomp them heal towing is easy to do, espically with the steering wheel that has a flat bottom.
All in all i want one, and am willing to pay one off over the next eleventy billion years.