What do you think about Jeffrey Pfeffer's book "Power: Why some have it and some don't"?

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What do you think about Jeffrey Pfeffer's book "Power: Why some have it and some don't"? I see one of his other books is highly rated on the MT Book Review site. I just started and have never read any of his other books. He is either harsh, pragmatic, observant, or all three. For those who have read it - what is the advice you found most helpful?