Cold Steel has been producing excellent blades since 1980. They design products with excellent geometry and strength. The CS blades I have purchased never had any blade movement with any of their triads or other locking mechanisms. I have an honest question: Why do certain brands like Spyderco get a pass with their lock-backs which have upward blade movement when cutting with downward pressure? I returned 2 Delicas and 1 Endura on Friday through the UPS Store back to Amazon because of blade movement. Has anyone experienced what I mentioned above?