I have always enjoyed the book. It was my "first" music theory book and it still helps me today. I never read the excess of pages with fingering patterns since if you grasp the basic geometry for the scale/mode then you just slide it around to a new tonic.
But the little sections where they harmonize exotic scales for you is literally indispensable! I can't tell you how often I reference, for example, what chord fits the sixth of the Hungarian Major Scale, or something like that, while composing. Sure, I could simply write the notes out and make triads, then figure out the intervals, but if you just want to make something quickly, it is helpful.
I caution against relying on this too much though. You should know how to construct scale harmonizations yourself.
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