2004 Volkswagen Phaeton V8 4dr Sedan (4.2L 8cyl 6A)
Let me state this clearly: The VW Phaeton is one of the best cars in the world. As a used car it is without peer. The very-high-quality interior is gorgeous, the attention to detail is astounding, the sound system is very impressive, comfort is second to none, and the number of micro-adjustments that can be made boggles the mind. The drivetrain reeks of German precision, and the design is thoroughly modern. My wife drives a 5-series BMW and looks every gift horse in the mouth. After riding in the Phaeton, she has been curiously silent. I think she's jealous. I have owned several luxury cars in the past (MB, BMW, Jaguar), and the Phaeton surpasses them all. It's simply a *great* car.
Build quality. Fit and finish. Quietness. Comfort. Adjustability. Attention to every possible detail, including several you wouldn't think of. But don't listen to me. Go drive one, and see if you don't come away saying "Wow!"
None. If you can't adjust this car to your liking, then you did something wrong.