I have been flying for 5 years now and all I ever use is ca hinges and I have never had one fail(knock knock). I have them on a gp patty, a hangar 9 cap 1/4 scale, a gp pitts many big planes and all are O.K. The biggest problems I see with the installation is 1. people push the gap to tight. 2. they don't drill a small hole in the center of the slot to let the ca wick int the hinge better. 3. they get a covering iron to close to the hinge when sealing the gaps and this will make the hinge brittle.