I've tried the Lock Laces (Nathan brand) and they worked great at first. But within a few months the spring that locks the laces weakened and the mechanism became worthless. This happened with two different pairs bought at different places. One a white-colored pair online, the other lime green ones from a local running store. Damned bean-counting companies that cheap-out on something that could be made right with a better part costing a few cents more.