First, it must be said that contents of this book leave almost nothing to be desired. There are excellent photographs and Wright's drawings are reproduced on a rarely seen scale - there are drawings for most verified projects. Printing and presentation is beautiful. The only criticism I have is the inclusion of some projects done in Louis Sullivan's office that cannot be attributed to Wright with certainty. These projects - including Sullivan's now-vanished summer house in Ocean Springs, MS and the house designed for Louis Sullivan's brother Albert in Chicago - are considered Sullivan's work by some historians. The Albert Sullivan house has a strong Sullivan decorative aesthetic that does not appear in Wright's work. Of course, Wright was Sullivan's employee, but his role is not always clear. The author also appropriately credits Marion Mahony's participation on some projects.
The difficult part of this book is its size and weight. Others who bought volumes in this series have commented on this, but it is hard to appreciate until you actually see one. It is very difficult to handle, heavier than the thickest Sweet's Catalog. It would be easy to injure one's back while handling it. Its dimensions make flat storage advisable, on a surface that can support it adequately. It does not easily fit in most bookshelves; the dimensions are 18.2 x 13.2 x 2.4 inches, as the product description notes. It is quite heavy for a book, nearly 14 pounds. It reminds me of a set of giant dictionaries that were in my home as a child, which required a special stand. It must be placed on a desk or table to use. I am strongly tempted to return it because of the handling issues. The book come in an orange box that also serves as a folding cardboard suitcase with a plastic handle. If you buy the book, the "suitcase" is handy - don't throw it away.