I went out to buy a 2010 AUdi a6 avant and came home with the cadillac cts sport wagon. It handles better than my wife's A4 and accelerates crisply. Handling including stopping are outstanding. The exterior is an eye catcher. The interior is very nice, not as good as Audi but very, very nice. I race cars for a hobby and would like to take this car on the track. Yet it is comfortable enough for my wife to haul groceries in.
Handling, Handling, Handling. Adaptive headlights seem like a gimmick but are really nice in rural locations. Heated and cooled seats are spiffy. The materials for the interior are the best I've seen on GM car. Dash is leather.
Would like higher quality switchgear, a premium leather upgrade option would be nice. Owners manuals are so-so.