I use these links on a very regular basis. I have my chains off the bike monthly for cleaning. I've never had a failure and if I ever do, at this point, I'll still be happy with their performance. These links repeatedly work very well for me.
Jettisoned the master rivet on my 10 speed chain and 1 link to replace with these bad boys. SO much easier to use/install/remove. Shifting remained normal.
I rated it a 5 star durability but haven't ridden much yet. I'll update it if there's a problem.
Works great on my 2x9 setup and the Shimano 10sp chain. While I have a 9sp rear cassette, I had to buy a 10sp 2x crank so I needed a chain that rubbed less (cross chaining) in the front ring. While its not technically thin enough to eliminate it when big-big or small-small it does improve the performance.
Considering how tiny these are, I can't imagine *not* having a couple of master-links in my saddle-pouch. I use these on my sportive bike that runs Shimano Tiagra (10-speed) and I feel perfectly comfortable knowing that, even in the unlikely case I snap a chain on a long ride far away from home, I can swiftly and easily reconnect the chain with a quick yank.
I love to use these Missing Links with SRAM chains instead of the PowerLock that SRAM provides. These allow for easy removal of the chain from my bike for cleaning without needing to replace the Missing Link. The SRAM products are generally a one-time use and thus new ones would be needed for any chain cleaning (if removed from the bike).
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