The biggest thing I got out of it is that it's okay to want things. Which isn't really poly-specific, but, as I said, I was in a bit of a messy headspace while reading it. It had stuff about healthy and unhealthy behaviour that I happened to really need to read around then.

The stuff that was useful for me was, IIRC, in the middle of the book.

I'll have to re-read it at some point to give a useful evaluation of the book when I a tad more sane.