I like the 5.7mm caliber very much, and several years ago I purchased an FN 5.7mm semi-auto handgun and I love it more and more every time I shoot it. It is without peer the most reliable and fun to shoot handgun I have ever owned. I would not hesitate to carry this gun as a self defense weapon because I have seen video of many different test firings into ballistic gel and it produces a horrifying wound channel that I honestly believe would take down almost anyone. I used to own a larger caliber hand gun. It was a Ruger P-94 40 caliber, but truly my FN 57 shoots as hard as the Ruger ever did. Of course anyone is welcome to criticize, and completely free to do so. That's what makes this country a decent place to live.