Some things you just have to experience for yourself. No amount of careful description can convey the thrill of riding a roller coaster for the first time. And with knives, you have to experience a Paul or Axial lock for yourself. Its like nothing else in the knife world--custom or production. Here is a bit about the lock. Its smooth feel, intuitive nature, and small size make it a perfect design for knife knuts, but its cost of manufacture makes it a disaster for knife companies. Its a flaw in the logic of capitalism. A knife this complex to make as smaller margins and smaller margin knives generally get taken out of production.
If you can find one, you should at least give it a try, the Axial lock is just too fun. Anyway, since there is no knives readily available, I am not going to do a review, but I thought this overview would be pretty cool. Enjoy!