A previous commentator claimed that this book was not readable enough for a mass audience--I have to disagree with this view wholeheartedly. I would say that his previous works, especially "Shadows of the Minds" were difficult to digest due to the amount of mathematics contained in almost all of the chapters (this doesn't negate the power of his ideas--he just makes them hard to understand). This latest work presents all of his major ideas on cosmology, quantum physics, and the nature of the mind in an extremely clear manner. His treatment of quantum physics is the best I've seen to date in a popular work. A short and rewarding read.
My one line summary is praise enough, but I will say that one of your reviewers appears to be miffed because a particular paragraph appeared to be arcane. I had expected, then, to read something about, say, Penrose's writing style. How could I have had such an expectation when that reviewer writes, ". . . there are a number . . ." There are a man who should read books on different topics. There are a man who should buy a book on grammar. There are no chance that he will do so!