2004 Volkswagen Phaeton V8 4dr Sedan (4.2L 8cyl 6A)
The Phaeton has an amazing design inside and out. It is by far the nicest car I have ever owned (which includes BMW, Porsche, Mercedes). However, in slightly more than two years it was in the shop twelve times. The dealership was great, service people fantastic, but the car has just too many issues. The electronic stuff and programing just are not durable. VW hit a home run in design and struck out on reliability. This is the least reliable car I have ever owned.
The interior both design, materials and construction are fabulous.