This is a pretty good book on the pedagogy of tapping; what finger goes where, cross string tapping, five finger tapping, phrasing with open strings, and stylistic examples. there are rhythmic exercizes, offsetting accents and alternating rhythmic figues, and everything has a corresponding example on the enclosed CD played both at slow speed and up to tempo.
That much said, the book caters exclusively to electric guitar. That might be obvious off the bat, but the cover makes reference to learning the techniques of Michael Hedges... I don't mean to split hairs here, since of course any techniques can be appropriated from one genre to another - but there is nothing in this book - nothing at all - regarding the differences such an acoustic translation would entail, the finesse and differing right hand techniques, the difference in force and focus.
Still, a good practice book. You could always figure out the harmonic material here - it's nothing new at all - but the physical exercizes are welcome and useful if you're interested in using this technique and its variations on an electric guitar.
Soloing examples are in rock, metal, country, with a few fusion-y licks too. Overall worth the asking price if you're willing to do the work. I suspect if you work from a book like "Speed Mechanics For Lead Guitar" or Satriani's "Guitar Secrets" this will make a good addition. I would not recommend it for beginners, though, unless you want to do a lot of repetetive practicing.