In 2022 my goal was to climb 1,000,000 feet (accomplished). So, while climbing about 3,000 feet per day I broke three of these chains in four months (and was fastidious about checking their stretch). Switched to a Red 22 chain and had no problems thereafter. I love this KMC chain, but the minimally constructed links just donï¿½t work, for me, with considerable daily climbing. In a normal year, say 500,000 feet of climbing they perform flawlessly. Also, my experience is that they stretch a bit more quickly that a Red 22 or SRAM PC11 chain, but given its lightweight and minimal design this isnï¿½t a surprise. All that said, it is still my preferred chain (unless on a long term climbing mission).
This is the only chain I use on all my bikes anymore. I have never had a problem or failure with this chain on Shimano or Sram Red 11sp drivetrains. It just works and looks good doing it!!!
So this looks cool, and is easy to install. It lasts at least 2x more than a conventional chain. But it's priced more than that. But if you value your time highly- it's very much worth it.