This is not a book for reading. If you are expecting lush, soaring, rhetoric you will be disappointed. The book arose from a blog and it shows in the writing - it's conversational and easy to read, but it is quite repetitive and the self-indulgent asides about Japanese culture get irritating fairly quickly.
That being said, Presentation Zen is a game-changer. This is not a book about beautiful prose, it's a book about appealing to the human eye and it does THAT in spades. Reynolds has become world-famous for building beautiful-yet-pragmatic presentations and in this book, he illustrates the thought process and basic design rules that underpin his approach.
A must-read for anyone who is trapped by corporate templates and endless bullet points and impenetrable charts and tables. This book will enable you to liberate your ideas and put them across in a way that people can understand and take action upon.