I do not like how slow the paddle shifter works. Just to big of a delay in my book. If I want to go to the manual mode it is usually for spirited driving and you get anything but that. Using the slap shifter its seems better but not as fast as other cars I have driven with this feature. My wifes old inifiti was much quicker. I find the leaving it in sport mode the tranny shifts fast and smooth and to just use the slap shift if you need a multi gear down shift, ie 7th to 4th. I now the SLK 55 is suppose t shift 35% quicker. Sure wish we could down load that program into our cars. What does everyone think about this topic. Seems to be a lot of manual boxs on this forum which I would have gotten except my wife didn't want to fight it in our traffic.