I purchased Principles of Correct Practice for Guitar and let it sit on my shelf for 3 months unread. I was studying with an excellent guitar instructor in LA during this time. He kept implying that I wasn't making the progress that I "should" be making. I figured I might find some helpful guidance in Jamie's book, since he was offering criticism, but not really giving me much direction.
Since studying Guitar Principles I have made truly noticeable improvements in my dexterity, speed and tone. The exercises have become a staple of my practice routine. I can see how these fundamentals effect all aspects of my playing.
I have just ordered the DVD that demonstrates the principles.
Any time someone tells me they are considering learning guitar, I tell them that they would be foolish not to start with this material. I have never found anything close in any other instruction book or with any of the teachers that I have studied with.
Thank you Jamie.