This book is AWESOME. It is well thought out and a visual delight. Not only does it have very detailed images of different handspun yarns, detailing how to successfully create each one, it also includes knit swatches of each yarn. With these swatches are discussions on the pros and cons of the yarn for its knitted purpose (such as cables or colorwork). The author, Jillian Moreno, is sort of a rock star in the spinning world and this book makes it obvious why she is such a popular writer and teacher of the topic. She has a blog and a monthly newsletter linked here. Check it out, she is a well of fiber knowledge and always has great book recommendations.
I first checked this book out from my local library and enjoyed it so much I bought a copy for my permanent book collection. It really is a great reference, with tips on how to achieve clean colors when spinning, different ways to ply and finish your yarn, and ideas on what to create with the yarn you spin. Ms. Moreno compares the different stages, from prep to finished yarn, to building a house. Her explanations are very easy to follow and the house analogy created a very cohesive book. And, as i mentioned, it is a wonderful visual journey. The colors, samples, and overall photography are really wonderful. Even if you aren't a spinner, this book would be fun to look at.
Bottom Line: If you spin, whether you're a seasoned veteran or a newbie, this book is great. It has so much packed in its beautiful pages, there is something for everyone. It is a great resource and a pretty book for your shelf.