The Audi A8 is the best car I have ever owned. I have owned Audis before and finally made the jump to the flagship. The only problem is that I could never go back to a lesser car. It drives like a dream, is simultaneously luxurious and sporty, does everything well, is unflappable under all road conditions, and has unquestionably the best interior in the automobile industry. I have driven it 600 miles at a stretch and didn't actually want to get out.
Perfect ride/handling combination; solid as a rock on the road; incredibly comfortable with heated/ventilated massage seats; built like the proverbial brick house
I have one and only one complaint: the navigation system takes a while to get its bearings again after driving through a parking garage.