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This is an excellent book and a must read for anyone starting out on a career as an agile Product owner. Having just completed my first Agile project as a product owner, I read this and discovered just why everything I found frustrating about the project shouldn't have been, and how we could have avoided it. I Plan to re-read this periodically every time I am involved in an Agile project in future.
A useful reference but the odd thing about it is that is written in a way that that lacks any personality, if you have seen Roman's videos online he is very passionate and interesting and this doesnt come accross in the book, for others that just want the facts it may not matter but for me it would help in the enjoyment of reading about an interesting Scrum role.