2007 Mercedes-Benz S-Class S550 4dr Sedan (5.5L 8cyl 7A)
The new S550 is quite a change from the previous S500. Much more luxurious, but faster, better road feel and better fuel economy. Best car I have had. Only time will tell about reliability. Got mine with special seats, keyless and 19" wheels. The I- drive does it right (intuitive like the Audi, not awkward like the BMW) Intuitive (unlike the BMW) and easy. Nav system is simple to use. Voice activitated controls extensive and it learns your own voice. Really works and is once, again easy.
Great looking. Fun I-drive. Good voice activation. Great screen size and display. Magnificent handling and very fast. Getting 19 mpg in town ... don't know why so good.
The stereo is poor. Weak sound and weak features. Previous stereo sounded better and previous CD would shuffle across discs. This does not. Have not seen such a weak system since 2000.