First, this book is only available as an e-book, but don't try to read it on a Kindle or small e-reader. It is full of illustrations, screen shots, and tables, most of which are totally unreadable on a Kindle. The author is a Mac fan, so the book was probably designed for the iPad. It works reasonably well on my similar sized Android tablet, but most of the screen shots and tables are still somewhat difficult to read. There may not be anything the author could do about this problem. As a how-to, the book certainly needs the illustrations and screen shots. It may just be a shortcoming of digital publishing, which is still in it's infancy. Maybe it should be read on a full computer.
That being said, the book is well written, well organized, and pretty complete, but short and easy to read. Mr. Kawasaki certainly was able to communicate his enthusiasm for Google+ and inspired me to try several things I haven't tried yet. The book also includes a plethora of links to further information.