Most chain failures on not a case of the chain actually breaking. A sideplate most often comes off then end of a pin and that pin is quite often a replacement/joining pin. Shimano's replacement pin idea isn't the best out there. Most master links seem to do a better job, IMO.
Campy however, with the thinnest chain of all in the new 11 speed group will continue to use a joining pin. These pins can't be used to join used sideplates, where a pin has been pushed out, only the pair of new sideplates at one end of a new chain. You get one chance to install the chain correctly.
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