No, I don't have the "Nuerburgring" Suspension on my wife's SLK 32 AMG. I was thinking about talking to AMG about it and have them do the install (around 1700 EUR) but my wife wants to drive the car like that for a while to see if she likes it or not. I have to respect her wish because it is actually her car, even if I drive it most of the time because she uses the ML55 as her daily driver.
AMG also offers raising the speed limit of the SLK 32 AMG from 250 to 280 kph, Pirelli P-Zero Rosso tires are mandatory and they install a fuel pump with a higher pump capacity.
AMG also offers the M-gear exchange system (some kind of semi-sequential shifting for the speedshift auto tranny) and the F1 safety car steering wheel for the SLK 32 AMG. Very interesting stuff if you ask me.
As far as I know, AMG can modify any suspension setup on their new cars, including the SL 55. I'm pretty sure they do that only at the factory in Affalterbach/Germany. I also know that some aftermarket Tuners offer so called electronic tuning for the air suspension/ABC system but this is nothing official and it definetely voids warranty.
The SLK 32 AMG's ESP system is very sensitive and it reacts too fast. When I turn it off, the SLK 32 tailgates pretty easy but is still enjoyable, especially on dry streets. Unfortunately the steering isn't as direct as I want it to be and you don't have that typical go-cart feeling as in the Boxster. But if I think I can get only a Boxster S with some options for the price of a SLK 32 AMG, the choice was easy, especially because my wife wanted an auto tranny and a fixed roof.
And it is a very nice daily driver.