I fully agree with one reviewer's (shawn murphy) comments. This book serves really good as a catalogue of what's available on the market right now (though not comprehensive enough). In general, the text focuses on customers' perspective, not from an architect's lense. Hence, you will know what you will get if you order these houses, but not enough information about the design philosophy and creative ideas behind these products. You can just pick up this book and skim through it at a bookstore. Write down the names of the houses and architects you are interested. Then google them for more information.
For example, I am really interested in the cool Bombala Farmhouse on page 102, and two other houses designed by Collins & Turner. However, the text in the book did not tell me a lot about these designes. You can find more information on the architects' website.
Another example: On page 122-123, the author described the House in the Woods designed by Resolution:4 Architecture. In fact, this very house is the winner of Dwell magazine's 1st Dwell Home Design Competition. You can find more detailed and thoughtful reports about this prefab design in two issues of the Dwell magazine (Oct/Nov 2004, and Dec 2004).
That being said, the book also has several strengths. It does provide a lot of information considering the number of prefab houses and the future designs or concept houses featured in the book. The section of "constructing prefab" is informative, too. Overall, it is an okay book (maybe 3.5 star is a more appropriate rating). But, if you are a serious reader about prefab architecture, this is not a valuable book to purchase and collect for you library.