I wish I'd had a book like this all those years ago when the task of learning to read music became such a chore. This really is a remarkable book - I know of no other that teaches the rudiments and more advanced levels of note-reading whilst being at the same aimed squarely at guitarists. There are masses of useful and increasingly interesting exercises, beginning with simple clapping to reinforce the idea of 'attack'.
My only niggle is that although the book is aimed at guitarists with frequent reference to string and fretboard exercises, chord diagrams are not included. Users of this book therefore need either a good working knowledge of chords, or a chord dictionary should be close to hand. Also, guitar tab is not used anywhere in the book- but don't let that worry you. The pace is well thought out and the lack of tab forces you to pay attention to reading the notation.
Apart from that, I can only say that if you play guitar and want to learn to read formal music notation - then look no further. this definitely IS the book you need.