 6 months and 7100 miles.  Have had a low coolant warning appear twice.  Audi Bulletin advises that air gets into the system during production or when refilled during previous repairs.* Update.  Problem has not reoccurred.  At 17k and car is performing well.* Update.  Nearing the 30k mark and have not had any additional issues.  The S3 is still a fun to drive car that performs well.* Update.  Approach 40k.  The car has been solid.  Lots of power and fun to drive.  The B&O sound system makes the commute so much better as well.*Update. 48k+.  No issues.  Car is running great.