There is also some maintenance you can do on the self-leveling suspension.
There is fluid that needs to be replaced at regular intervals, as well as something called 'nitrogen spheres' or something like that.
Many owners of cars with the self-leveling suspension have noticed huuuuuge differences in ride quality when these have been replaced.
FWIW, most of the high performance models have the self-leveling suspension, like the 190E 2.3-16 and the 500E.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".