at 39K miles now, car is an early 2006 model so one of the first. Reliability has been surprisingly very, very good. Car starts right away each time, no fitment/squeak issues, etc. Very very tight vehicle.
The only issues: In early Dec the car was in for a 35K mile service and the techs found a torn CV boot and a slight leak out of a plastic coolant flange on the engine (~$25 part). The boot tear looked like a freak factory failure (overtightened clamp). I have heard of no other CV boot issues on the message boards, nor have I heard of any coolant leak issues.
2006 A3 2.0T DSG
Sport/Bose/Xen/OS + Revo, H&R RSB
Phoenix, AZ