For the money it is hard to beat the Spyderco Endura and it has a drone/trainer. Without a trainer you will never be able to safely do realistic force on force which is a necessity for anything you are going to stake your life on. Knives that open with any sort of a button or gizmo are bound to fail under stress. Murphy's law is always there but you can still do your best to limit your exposure to things that are more likley to induce failures.- George