I love the little round , even though good sense tells me I shouldn't . Its not as effective as 9mm for self defense IMO and I have watched tons of videos etc which more or less validate that for me. Its super effective as a penetrating round and with the right ammunition yes it zips right through body armor , I want a FN 5.7 pistol pretty badly to go with my PS90 carbine but may end up getting a PSA until I can find an FN. In fact the 5.7 is why I am selling my High Powers .. I think the little cartridge is perfect as a backpack gun for camping and using for dispatching critters as required .