After many years of riding and many shimano chains without ever breaking one. I decided the sram chain was a great idea for easy maintenance, I installed one on each of my bikes when chain replacement time rolled around. Once I started adding up the loaded commuting miles the "power links" started breaking, I broke about 9 likes between the bikes, I replaced chains and tried replacing just the links when I did maintenance but the links still would tear open at the elongated hole while pulling a long hill in a lower gear with the bike loaded for my commute. after 6,000 miles worth of chain repair, I switched back to the old trusty shimano cn7700, or now cn7703, and finished the season with 5,800 more miles of riding without any chain problems.