I dont know about JohnnyMacs LOL but that Garvin fellow is an odd bird. I have had private conversations with him which I wont post here because they were private. But hes just out there. Hes very skittish, paranoid, adhd, etc I cant take anything he says seriously. I joined prepper net thinking it sounded like a good idea till I joined and talked more with him. LOL is right. That guy is a joke.
Maybe a beginner will glean something from him but anyone who knows ANYTHING wont. save your money and read post from sites like this one, or survival monkey, amrron, (which I hate amrron has partnered with him) or any other radio related site.