This book has high praise from people involved in public speaking and good reviews. I can definitely see why, but I don't think it is perfect.
Max is an acknowledged expert in public speaking, and brings his obvious experience to the book: all the way through you get the sense of experience coming through. His bias is towards political speeches, but there is enough in the book to be genuinely useful for any kind of speech. His specific area of interest is in rhetorical devices: things like contrasts, and analogies, and the like, that help get your point accross. On this territory he is excellent.
But this is just one chunk of the book. The other bits were less perfect, although all were very sound. His discussion on visuals was a bit muddled: swinging from exhortations to make bullet points appear one at a time in Powerpoint, to condemnation of words on slides at all.
The section on the use of the voice was good, and clear.
Where I think the book was weak was in two areas: firstly on body language. He rightly asserts that lots of the modern body-language hype is meaningless, but he never serious tries to talk about how body language can be another visual aid at the lecturn (compare the expressionate Tony Blair and paper-shuffling Gordon Brown for a good and poor body language speaker). He also never gives constructive suggestions for using the body to retain eye-contact, and other ways to command a stage seen in all the top-paid keynote speakers.
And secondly I think it was weak in terms of structuring the speech. Rhetorical devices are only one part of rhetoric. The construction of an argument is also crucial, and it would have helped to understand how to put the whole speech together in a more concrete way that 'pre-introduction, introduction, main-bit, summary, conclusion'. The structuring of the speech section was very week I felt, and I really wanted to know more.
I'm not an expert by any means, and despite the fact that I didn't learn some things I was very keen to learm, I did get a lot from the book. It is very readable, and I would recommend it.