The premise for this book sounded great! The whole idea is, gather a bunch of published science fiction and fantasy authors and get them to give their advice. Unfortunately, the advice varied a lot, with only one or two of the essays being particularly useful. (And some were totally useless - market conditions in 1987 just aren't the same as those in the present day, and half the magazines they mentioned are gone.) Some of the world building ideas were interesting, but in general, authors seemed to go on and on about what worked for them, rather than what might work for a modern author. (And some of the tips were really dated. Like, one of the suggestions was that "female characters don't need to be damsels in distress"? Yeah, anyway, I think that most modern writers know that. Moving on...)
It also bothered me that it was structured as "two pages of article, ten pages of short story". (Especially as most of the short stories weren't all the great, IMHO, and most didn't really illustrate the point that the essay prior to them was trying to make.) I felt suckered in by "how to write", when the book was, to be honest, more of a short story collection than a book on writing.
Probably the only bit I'd highly recommend (which might be worth a library check out) is the chapter by J. N. Williamson (who I've never heard of, but who edited the book) on "Plotting as your Power Source". He offered some really good advice on how to plot out novels, which was worth reading. But I'm not sure that I'd pay money for one article that I liked.