Amazon reviews for this book are interesting. One common consensus seems to be that while his previous two are both very good, this one doesn't actually offer too much in the way of new information. But that's really only an issue if you have read GCBC/WWGF, I suppose.

Certainly it's getting a lot of good reviews as well, but the average score of 4.1 is a bit down on the earlier books, possibly for the above reason.