I changed the chain on a campy cassette (10s) and it couldn't have had more than 2000kms on it and it skipped! I could see little to no indications of wear. I was mystified. With 10 speed shimano I have worked on it so much I can tell by looking almost every time. I was really disappointed and still have the cassette hanging around because it looks perfect. Really annoying for how pricey the stuff is. I replaced it with a veloce cassette and called it a day. I still have some old 10 speed chorus because I won't be able to get anything for it, but I am a sram man now with shimano cassettes and chains.