The 2005 Cadillac CTS is just great all around. I love the design on the exterior, it is just stunning. The interior is just as great, I find it to be very comfortable, and luxurious. The performance is even better, you really feel the accelration of the V6 rated at 255 hp. The control of the vehicle is very good as well, I really feel in control when driving. It has a very solid, strong feel to it, and it feels great on the road. It has a quiet cabin, with very good shocks.
The climate controll works great, when it is very cold out it gets the car warm right away, the way it should. The performance, the engine ,and the control.
None, other than perhaps a little better gas mileage.