I read Zutz several decades ago and my recollections are a little fuzzy, but I was not overly impressed and I've never gone back to it. I do recall his obsessiveness with straight grips, splinter forearms, and hands in a line, which I thought odd coming from a competition shooter (I am a high-order proponent of the pistol grip). There might have been some other odds and ends that had to do with misconceptions of simple Newtonian physics, something that seems to trip up a lot of gun writers. I might still have the book around here somewhere - it's free is I can find it and you can pay the postage.