This book is good as a 'stand-alone' guitar book with songs graded by difficulty. It really comes into its own, however when it's used alongside the justinguitar.com beginner's course (which is freely available). There's a fair selection of songs for each level of the course, but whether they work for you is ultimately down to individual taste.
The printing and typesetting are clear and well laid out, and there are a few performance / more advanced hints for each song.
It's a shame that the book isn't spiral bound, but that's the only niggle.
If you're following the course, and can spot a few songs you like, then the book is excellent.