First point - the book was very cheap. Is that good or bad?
Several of the 'Expert' contributors of the book shot themselves in the foot in my opinion, using stupidly long sentences, and unnecessary 'clever' words. Professional writers' jargon? I don't know- I don't know any professional writers. For me, it just clouded what they were trying to clarify, so said much about themselves.
However most contributors gave me food for thought, which is what I hoping for; showed up flaws in my thinking and writing effort so far, which was extremely helpful. Even better - two or three of them confirmed for me, good things contained in my writing (which I produced without any prior in depth analysis of writing, or attachment with any writers' workshops or groups).
So - worth reading, but not brilliant.