I've loved this car since we got it new back in 04. And now I'm purchasing it from my parents, thanks to luxury cars' famous depreciation. This AWD car replaced our beloved 2003 Audi A6 and surpassed it in almost every way (gas mileage being one of the only exceptions [minor]). The car is built as well if not better, has AWD, is incredibly fast for a heavy 4-door, looks fantastic in every angle-inside and out, fun to drive (handles well), and the stereo wipes out every other car stereo I've ever heard-standard or aftermarket. 97k miles on it and has been absolutely reliable. My parents have now bought a new CTS-V and will probably stick with Cadillacs forever. I will likely do the same.
Northstar V8, AWD, Bose 5.1 sound, exterior appearance, interior lay-out and quality (still my favorite design ever), magnetic ride control (handles well & can be smooth if you want it to be), great interior and has held up well, keyless system, lights, auxiliary input on a 2005 car, fun! etc
Leg room maybe? Oh yeah! glove box is kind of hard to access with a passenger.