I've used a couple of KMC 10sp. links for almost the life of several chains and around 10k miles each link. Never had one fail in any way and they get taken apart on average about every 400 miles. I replace them when there is visible wear in the pins. Some think this is nutty but I like to find these things out for myself as to how long they really last. I'm no power monster but do weigh about 200lbs. Just my experience.