I sold the Campy 10-speed group on one of my bikes partly because the chair wear was so poor compared to my Shimano 9-speed group. I was lucky to get 1,500 miles on Campy Chorus/Record chains before they started shifting poorly. In contrast, I can easily get 5,000+ miles on my Shimano 9-speed chains without noticeable degradation in shifting. Another factor in that decision was the much higher cost of Campy chains and cassettes. I have never regretted that decision.