Bought the STS V the first week of December and have taken a couple of 300 mile trips in it. It's very comfortable, powerful and a real pleasure to drive. Positive handling and extremely smooth on the highway. You forget you're driving a big Caddy and think you're in a very fast sports car.
Heads up display, lane warning, blind side warning, comfortable seats, 15 speaker Bose surround sound, push button start, 6 speed trans, powerful engine, blue tooth tech, steering wheel controls, auto wipers, auto dimmers, about every thing on the car!
I would reccommend putting the siblings 6.2 litre motor in this car; however I understand that after 2010 the STS will no longer be made (too bad).