My 2009 CLS550 is a step down from my 2007 S550. But not by much. Same engine, same transmission, same COMAND system functions, same Harmon- Kardon logic 7 sound system (2 fewer speakers than the S550). Superb performance which you can customize six different ways" choice of Sport or Comfort transmission shifting, coupled with Comfort, Sport 1, or Sport 2 suspension and body control. You can also downshift the 7-speed transmission using the gear shift knob if you want. Navigation improvements for '09 include gasoline brand logos instead of the old pump logo. The iPod interface is now standard, The LED rear turn signals are eye catching. Rear headroom stinks.