I have a pair of Sl's, 2 Sl candys, 2 pair of smartys, mxrs, and c's. I broke a wing on the c's and hoping Crank Bros. will warranty them. I wore out the hook that stops the spring from going to far on one of the Smartys. The Sl's, Sl Candys and mxrs are still in really good shape. Sl's are the most durable in my opinion.