The book is absolutely packed with great designs and stories of the designs the artists, Threadless' history and everything you could possibly want to see. They've obviously spent a huge amount of time collecting the information and writing the book, compared to many other tee books this is actually readable and will take a fair few hours compared to the half hour of some others. The book is listed chronologically documenting the history of Threadless but this is broken up with a huge collection of images of their tees each with a small amount of information and some with more. Also many of the more popular designers have their own section in the book about their Threadless and other designs and also companies such as Glennz that have almost come out of Threadless. For me this book hits exactly what you want out of a tee book rather than just a collection of images of nice shirts the emphasis is on the story telling aspect be that of the company the designer or the story told by the design itself.
Overall I am extremely impressed and would say if you are going to own one book about t-shirts this should certainly be it (if two it should be this and the Maki book!)