Hi,
i have read through fretboard mastery before and i think its not too bad a book since it covers quite a number of topics and of course the cds provided help much with the examples.
however i think it comes across as being too general, so if you are the kind that likes to be told what to practice rather than to devise your own practice after being given the necessary information then this book might be not be good.
whats your aim in choosing between both books?