I was reffering only to the Polyuerathane bushings on the market, I have no experience with the others you mention, and will not comment on as a result. I also know people who had these bushings degrade in 3 years requiring replacement and Energy Suspensions tell them that they don't last forever and are not warrantied forever as a result. Keep in mind this can be 75,000 or more miles on the street, far more than any race vehicle sees in the same time.

And yes I agree they do firm up the ride a lot. Something that would seriously degrade the ride quality of a mercedes for a minimal at best improvement in handling.

I myself would not do it if they were availible for my mercedes. Even though I am glad I did it on my honda.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche