I've owned and loved '67 Austin Cooper S, '95 Mercedes C36 AMG, '01 Audi S6, and '03 Audi S8, but this RS6 Is at the top of the heap! The seats are the most comfortable I've had in any Audi. The 3 spoke steering wheel is perfect. The acceleration is indescribeable - I'm thinking maybe space shuttle! If you hit the brakes hard, you get a straight stop that feels like you hit the emergency catch net on an aircraft carrier! The Quattro does it's job flawlessly and undetectably. Despite the incredible levels of performance, this car is docile enough that my 76 year old mother could drive it.
acceleration, braking, seat comfort, stealth looks, an exhaust note at idle that works better than a testosterone patch, a cruising exhaust note that's soothing and not loud or crude, 24 mpg if I'm not driving in town. No rattles or squeaks.
other than updating to 2005 A6 amenities like rain- sensing wipers, auto headlights, and DVD nav, I wouldn't change anything at all. And that's saying a lot for me!