The car isn't perfect, which may be why people may have turned to competitors like the Porsche Boxster S when they bought these new. Unlike the Porsche, the SLK 55 was only available with a seven-speed automatic transmission. If having three pedals in a non-negotiable for you, the SLK 55 is not your car. Inside, the SLK is very comfortable, but the Mercedes COMMAND infotainment that is used in the car is way out of date. Although we did find a few ways to replace the old head unit with something more modern. If you like convertibles, and are looking for a comfortable daily driver that also has the shouty characteristics of a German muscle car, the SLK 55 AMG could be the perfect car for you.