I am a bit turned off by the hype in the ad. PhD level training for $19?
“The book starts off with a foundation of simple, fun, dry fire exercises and will take you all the way up to wicked smart, PhD level firearms training psychology and physiology that will completely transform the way that you view training.”
That being said, I did find 2 online reviews that indicate that the book could be beneficial. While there were some criticisms, no one panned the book.