I have KYB shocks on my ‘56 CMC Speedster on a ‘71 VW pan but only have about 18,000 miles on it, so since I don’t have a comparison with other shocks they seem to be just fine when I drive. When I used to cross the Yolo Causeway Bridge going from Sacramento to San Francisco I used to feel harshly the 21 concrete expansion seams in my real 1960 Porsche 356B coupe, however, I can barely feel them at all when driving my CMC Speedy.