The original SRAM chain did fail on a climb, but not on a particularly steep portion. Nor was I shifting, but it's always possible an earlier shift may have caused a problem. My stoker is very good about unloading the drive chain when I call a shift, especially important on the Davinci since without a rigid connection between captain and stoker I can't directly control the chain load. I'm going to stick with SRAM chains and see how it goes. My LBS stocks the longer lengths I need for my drive chain so I don't have to use two quick links. While I don't carry a spare chain I definitely have a good chain tool and quick links.