Their earlier models didn't work for me, but this 1507s sure is an awesome stuff. I was worried about the ti stop blocks on the blade due to screw construction, but they are actually press fitted, I couldn't take them off even took out the screw. The lockup never move and no stick at all. I just wish that lockup could be later. The gap between blade and scales are super tight, thiner than my Sebenza 25, this guy really knows what he is doing.