Im on the side for heel lock, I found my way to a Boat Vaypor S for my shoe of choice. I have had Sidi, S-work 7s, and Shimano S-phyres and by far the Bonts have the most customizable body in which after heating them you can squeeze the heel as much as you want to make it lock into place. I come from a hockey background so the heating process came natural and I find they fit excellent