Bought it CPO 3 months, 2K miles ago and love it. No issues so far-knock on wood. Very fun to drive w/ 6-sp manual. Interior is luxurious.. Armrest is a bit awkward-it covers the parking brake. I've cracked my elbow on it several times when it's lifted up. Armrest lid latch broke-this is a common problem. Dealer replaced under warranty. Overall, lot of fun to drive. Before buying, I drove two G35's and three 328i's, and don't regret for a second going with the Audi. The Infinity and BMW had much more power, but A4 was just more fun to drive. G35 had too much plastic in the cockpit. BMW oddly enough felt too refined - like it was driving and I was along for the ride.
Great driving feel. Interior, exterior styling. Simple and sensibly laid out controls. Excellent highway MPG.
Better armrest latch. Heck, better armrest layout. Incessant seat belt chime is too much. Rear leg room is very limited.