I just sold my A6--I had it for 2 years exactly. It was amazing in the snow and made wet roads seem dry. This was by far the best feature of the car. It was very comfortable (seating and ride), more so than most BMWs I've driven. The main reason I got tired of this car was it's lack of power. I mean it's not slow but you have to floor it to take a camry at a stoplight. Handling is good. The fact that I could not have a cd changer or deck installed really irritated me--the only way you can listen to cd's is buying a FM modulator ($250). Bottom line is it's a kinda boring car. Thats why I got a 3-series now.
AWD--Has gotten me home soundly many times in the snow. Very safe car, it's a good family car.
MORE POWER! Has the same engine as a Jetta VR6 and weighs about 1,000 lbs. more. 172 hp doesn't cut it. Had some electrical problems with the moonroof and dashboard.