My 92 300E with 168K miles still has the original Sachs on it. My mechanic says they're fine. I haven't driven another 300E so I don't have a point of comparison.
At any rate, I've been studying suspensions for 2 months now and finally decided that the Sportline upgrade was the best bet. I decided to start with the Sachs replacements.
This UK thread on a W202 Suspension Setup helped me make up my mind to go this route. Check it at:
http://mbclub.co.uk/forums/showthread.php?t=11872&page=3&highlight=sachs
I'll find out in a week or so.