Aby 2 The idea and design is good, the product is cheap enough to buy and the lace itself is OK for the cost. BUT, the force needed to squeeze the lace through the passages in the lock is beyond ridiculous. I can bench 100 KG, but pressing the spring to open a gap to let the lace pass through was almost impossible! Maybe I got a dud, but once it was all set, it works fine. But I would never repeat this again. Probably would try to get a more reliable brand in future or buy it from a shop so that I can check how strong / weak the components are. (unless you are friends with the local gym ;o) )