Originally Posted by
himespau
Since KMC advertises the reusability of their quick link (as opposed to some other manufacturers who call them single use links), I go with KMC even though a lot of people claim it's got the hardest manufacturer lube to remove. Also, they're usually the cheapest, and I buy like 3-4 at a time.
I've been waxing a three-chain rotation of KMC 10sp chains for the last ~9k miles. By my estimation, each quick link has been fastened/unfastened 8-9 times. While I accept that no quick link will last forever, I still need the tool or a decent lean on the crank to reengage them. As soon as I'm able to fasten them by hand, I think it'll be time for new links, but they're still pretty solid in my estimation.