IIRC, this confusion began with SRAM 10 speed links labeled for one use only. I've never seen any clarification from SRAM as to whether that actually means "one use" or "one chain." A KMC rep posted here and confirmed that KMC links could be reused for the life of one chain. It's good to hear that some are successfully reusing 10 speed SRAM iinks, having more options is better.