So far nothing major has broken or gone bad. But the valve cover gasket was leaking and had to be replaced, but that was only 10 bucks, and I put it on myself.
There are some minor oil leaks, but you find me a Volkswagen product that doesn't leak oil. Right now I'm needing to replace an oil hose on the front of the engine and found out that it's $200 for a new one, but I could find the hose off of an old one at a junkyard for under $50. So far that's all that's been serious on it.
The car overall is great. As long as it's taken care of, the engine will run just about forever. But beware, when something does go wrong, Audi's are NOT! cheap to fix, the parts for those cars are astronomical.
On the performance, it's a little slow for my tastes, but she is pushing 15 years and counting.
It gets great gas mileage, about 25 miles to the gallon, and with a 21 gallon tank you rarely have to fill up, but once every week to two weeks.
I have owned several coupes, including the legendary UR-Quattro Turbo, and I love their individuality. You say that you would never buy another car if yours did 0-60 in under 10 seconds - well try a manual! The UK 2.2 5-cyl did 0-60 in 9.3 seconds (136bhp). There was also a 160bhp version sold in Germany. Good review though.
If you like the S, but want it to be faster get The Audi 5000S turbo it is plenty fast.
I have so far had 2 of these that didn't leak oil, or use oil for that matter. They both had 200k or over on the clocks.