I note that nobody has mentioned the Spyderco Compression Lock when talking about strong locks for folders, or Spyderco's adjustable pivot, for that matter. I have the Compression Lock on several of my Spydies and I can see no reason to think that it would ever fail and it is ever so much simpler than the Axis Lock. Complexity raises the question of Murphy's Law, remember, "If it can go wrong, it will go wrong." And the First Corollary to it is, "It usually goes wrong at the most inopportune moment." That is why, in the case of folding knives, I tend to prefer the simplest effective lock, and that would appear to be the Compression Lock, although, I must admit to liking the Axis Lock for EDC as well, especially on their Model 921 Switchback. I also like it in two other Warren Osborne designs, the 770 Gentleman's Folder and the original 940.