My dad had an Audi a few years ago. Finally sold it because it was costing him so much to maintain it. He owned it for almost 2 years and in that time he had to replace a lot of stuff. He spent thousands of dollars on repairs to that car, and it was only about 2 years ago.
My driver's ed teacher's brother had an audi. An electrical problem with the wiring of the car caused it to catch fire.
Audis are very fun cars to drive (my dad LOVED flying around in it) but they're maintenance hogs. Dad spent more in a year and a half on that car than he has in about 5 of his cars combined.