I bought my 2005 CTS Luxury Sport in Oct, 2004 with 300 'demo' miles on it and have beaten the tar out of it. I currently have 97,000 miles on the car with minimal complaints and overall, would not go back to the '97 Audi A4 I traded in for it (Caddy blows its doors off). While the 3.6 is known for oil consumption, it was purposely built at the high end of tolerances to free up horsepower. Consumption remains just under 1 quart per 2000 miles, which is within specification. Aside from brakes and tires, I have had a water pump, rear differential seal, and a headlight module replaced (all under warranty). Overall, I love the car, and it remains rattle and wind noise free after 97k miles.
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