I leased a 05 CTS and have numerous problems with the dealer as well as the vehicle itself. Rear end differential replaced at 800 miles due to a howling noise at approx 45mph. Passenger reading lamp out as well as passenger temperature toggle not working. It's a shame as I love the looks of the vehicle but would suggest that buyers beware, I don't think the quality of this vehicle matches the price range. I am currently working with GM for resoultion to all the problems, it will be interesting to find the outcome.
Love the looks and design of this vehicle. Fun to drive if everything works like it should.
A little more headroom with the moonroof package. Check the rear end for continuos howling during acceleration in the 45mph range. Watch out for dealer installed options