I have had this car for almost a year now. Every option has come into play by now and the ride is comfortable and very aggressive. The Tiptronic transmission isn't very good at all though. It has no control nor has any power behind it. I drive the STS about 400-550 miles a week and I love it. It is great on long trips and very economic in your daily drive around neighborhood. It has had a few computer problems, or re-calls. But I think that the wear is partial to that. I love the car, I definitely want another STS in the near future.
My favorite featue would be that when you turn on the car, the red gadges turn on.
The horsepower of the V6 engine should be stronger and the torque should be about 15-20 lbs. more.