I would NEVER, EVER buy a demo. I've been to an "Audi Sport" event where dealers use their S/RS stock and let people take them out for 30-40 mins near Oulton Park. They also had professional drivers taking the cars around the track. The cars were coming back and their brakes were smoking. I can vouch for the performance of the RS4/5/6. Epic. Even the Sales Manager for this particular dealership joked "oh we can't sell any of these cars now!" but what else would they do with all of their S/RS stock from 3 different dealerships??? Never, ever, in my life, would I buy one after this. Actually, it's just another reason NOT to deal with this company (as if I needed another!). I had a good day though, I just pity the people who buy the cars afterwards.