I have a 2008 C220 CDI Sport Auto, which i've been having problems with sluggish gearbox. I had the firmwares updated the other week and it's solved a lot of my problems and slightly improved the fuel economy. So if you're seeing problems with slow gearbox changes, I would highly recommend you get it updated. In my case, the firmwares had never been updated since new, and mine was one of the first cars.