 I have had my A3 for over a month and absolutley love it.  The only option I wanted and got is the Open Sky System, which has worked pretty much flawlessly.  I've been averaging between 29 and 30 miles per gallon (highest slightly over 32, lowest slightly over 26).  Runs fine on 89 octane and hasn't required the addition of any oil.  Cargo room seems endless (I can fit two large laundry baskets behind the rear seats without having to fold them down).  I have noticed an occasional light rattle in the driver's side A-pillar, and, when approaching speeds of 80 mph, a humming noise from the passenger side of the front sunroof.  Also, parking brake is obstructed when front armrest is down.    