If you really want to learn the program Silo, this book will have you covered. It is rated for the Novice to Intermediate and that is what the book is for, though a beginner or expert may be able to use the book as the basis for learning Silo's features, the project would be a bit much for the beginner and probably bore an expert level user.
The book's layout is excellent and there are plenty of pictures. Most the of the images, and they're referenced often, lack enough contrast to allow you to actually see what the authors are talking about. However, you can download the models on a chapter by chapter basis if you really need to visually confirm how something was done. There is also a Bonus chapter on UV Mapping that is a must download.
I'm not someone who feels they need to model everything from scratch and only model when I simply cannot find what I'm looking for or need something special and got the book to get a better grasp of some of the more advanced features of Silo (Displacement Painting, etc.) So for me, I found the book to be an excellent purchase from Amazon.
If you own Silo, and your name is not Glen Southern, Amazon has the book for you!