I just don't know about those devices. I mean, I'm sure they are very functional but, I don't think I could rely on one to save my or my family's life. I am a firm believer of being fully comfortable with one weapon that I contiuously train with to become and remain very proficient with. And part of a situation that would require pulling a gun on someone involves the perpatrator seeing that you are about to end his life. That sometimes will buy you a split second since he now is trying to decide whether he wants to follow through with it and is it worth it. I have to believe that unless you are the one trying to be devious then those "spy" weapons don't really have much of a purpose. And I can only imagine the cop's thoughts and implications you would be facing if pulled over with that in your vehicle. You'd instantly be "labeled". They are pretty cool from a gadget point of view.