I adore this book. While I have owned it for a few years, I have only recently begun to create some of the rugs featured in the book. In the interim, I've enjoyed reading the history of the rugs, looking at the beautiful pictures as well as appreciating the complexity of the designs.
Last but not least, I have also been grateful for Frank Cooper's attitude towards the projects. It is apparent that he does not expect you to slavishly follow his charts to the last detail. If you feel like making some color or design changes of your own, then go ahead. He certainly felt free to make changes as he worked the rugs (after charting them) and he tells the reader all about it in each write-up.