I thought that I'd re-visit this thread since I've had
PlaneTalk for more than a year now.
I've read the book several times, it's a very easy read and I seem to find something new each time. It has given me a terrific insight into how the guitar, music and chords work.
My personal problem was failure to practice enough, so I didn't get the most out of it, although I never regretted the purchase purely because of the knowledge!
A while ago, some of the people at the music club I go to had told me to bring along my guitar and just join in with others, I can't bring myself to sing in public yet but I thought I'd give this a try.
I'd just been following the music with chords but noticed that other players were doing other things which enhanced the overall sound, suddenly the lightbulb came on and PlaneTalk has a whole new meaning. I play there regularly now and I enjoy the joining in tremendously. I'm a long way from proficient and I still can't talk in terms of roman numerals but I have the tools and the guide to get there, and just important, I have the desire. Occasionally I even get the key right without anyone telling me!!
For the price of a couple of lessons PlaneTalk is great value and unlike lessons you can keep referring to it. Now it's my turn to recommend it to guitar players, even if you're an absolute beginner you'll gain from using this book and DVD.