 After having a couple of MBs with quality issues we are extremely pleased with the rock solid, problem- free S550 we have now had for several months and 3,000 miles. We waited 6 months to get an S with the ABC option but ABC provides such a great combination of ride and handling that it was worth it. COMMAND is very easy to use (I have never opened the manual) and allows for a dash that is free of button clutter (particularly compared to Lexus LS). You can get gas mileage well into the 20's on the highway but it can degrade to below 15 mpg in urban driving.  But you feel so great in this vehicle that you hate to have to get out when you reach your destination