The formatting of the book frustrated me a little. At first, she told me what she was going to say instead of actually saying it, then she continued to dance around the topic from many angles without the practical, tangible element that would have grounded me to fully understand what she was trying to say. For chapters and chapters all I really got out of the book was, "the use of power/body language is important," which I already knew.
There were some details about commonly seen patterns of interaction that were interesting, but I would have marked them in my head more meaningfully if they'd been interspersed with thoughts on how to respond. Instead, there were too many isolated ideas to learn all at once and by the time I finally got to the last three chapters when the author starts to give real action steps, I'd mostly forgotten anything interesting from earlier in the book. Likewise, the action steps were packed in like a whirlwind, one after another with little context for how to apply them, so I didn't learn them very meaningfully either.
The very last chapter was the most clear chapter in the entire book, because it was a story that included both what went wrong and what needed to change in the same story, and it brought in ideas and language from all over the book, making them concrete. I wish the whole book had been that clear!
I'm not saying don't read the book. There are nice group reflection questions after each chapter. Maybe if you're discussing each chapter with a group, you can help each other make sense of what she's saying; she's clearly an expert.
There's a lot here to learn, and I don't regret reading it even if I only learned <5% of what I could have. Maybe the fuzzy ideas in my back of my head will prove useful even if all that happens is that I know what to re-research when something goes wrong.