Up until the past two chains, I've been using Izumis with their spring clip quick link and am thoroughly convinced of the clip's ability to hold my chain together. My last chain was an SRAM and came with a snap-on quick link. I didn't use it, opting to instead reuse the spring clip from my last Izumi. It held again, famously by the way.
I just installed a new KMC chain with a snap-on quick link and have decided to give it a try. While understanding the design of it, I must admit that I'm a bit uneasy about it. Has anyone ever had one fail on them? I can't see them failing unless the chain was tweaked laterally at that precise point somehow... but still.
Also, on the subject of chains: Is it just me or isn't the feeling of a new chain simply one of the best things in the world? It has to rank close to a new pair of socks, for sure. My drivetrain feels so responsive again! And
so quiet.