Just bought the book. Anybody ever read it? Anything you guys learn from the book that was particularly helpful? I'd kinda like to know what's it's all about in a nutshell before I start. It's kinda long.

Peavey 5150, Squier, Ibanez RG2EX2, Yamaha F150, Ibanez RT150, MXR noisegate
In a nutshell, it teaches you to approach melodic improvisation using arpeggios and chord extensions, as opposed to the more popular approach of using scales. If your default approach to improvising over chords is to associate each one with a particular scale, then yes, the approach taught in this book is going to facilitate growth in you as a player, and your ability to improvise.

But what I don't understand is that you bought a book, and rather than read it to find out what its content is, you want a summary of it on a forum.