Not sure which area of the forum to post this in but, seeing as it relates to technique...

I've decided to start putting some serious study into theory and am wondering if anyone has read this book: Modern Method for Guitar by William Leavitt

Here's the link:
http://www.berkleemusic.com/store/product?product_id=11250&category_id=3

I've been playing guitar for years and have developed my own style but I want to be able to take things to the next level. The book tries to get you to learn the fretboard through site-reading and contains no tab at all. This sounds tough but also really interesting. Let me know if you've read it and what you thought of it.
Thanks