 I traded a 2016 S550 for a 2016 750ix with very low miles on it. That was a big mistake. The ride and drive is better in the big Merc - and the new 750 feels soft and "un-BMW like". In addition, the front seats are better in the Merc. Finally, the iDrive technology in the new 750 is gimmicky and unreliable. It is constantly glitching with my iPhone and I have had it into a dealer 3 times to update the software to remove issues. Bottom line, BMW had 2 years after the S550 redesign to one up MB - and they embarrassed themselves by launching this poorly engineered car. I have owned many BMWs over the years, but this will likely be my last.