If you already have a basic understanding of harmony, theory, know the "basic" chords to some tunes, and can read music, the Omnibook shows in actual notes what nobody's ever really adequately into words, at least not yet, not to my knowledge (although I've yet to read the Carl Woideck thing). Even if you have nothing but the most rudimental knowledge, but have a freind who has more knowledge to go over the solos with you and illuminate what's going on, that's better than reading "musical analysis" (a whole 'nother creature than criticism, fwiw) that is either superficial or impressionistic.