Both of Benzes still have their original shocks... the 300SD is currently at 157K. They both ride fine. Except the 300SD vibrates like hell at high speeds since I put the 16 inch wheels on it. I attribute this to the higher contact area between the road and the tires (went from 205/70/14s to 225/50/16s). In terms of work done by the shocks, the original shocks on my cars seem to be doing their jobs well. I once read from a forum member here that those Bilstein shocks take a really long time to wear out.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver