The Urth Orthodoxy book is certainly, as usual in this short booklets, very useful and high quality material. In this case we have a clear and complete depiction of the church as an institution, with its history, power players and structures and so on. But also, and for me more important, it has a very interesting depiction of the religion itself, from it's cosmology to more lore on the saints and the teachings and practices that go on during any time they have mass in the Fading Suns universe. Add a little few extra mechanical things like new paths, a few new theurgy powers and so, and you have a pretty complete book that certainly gives it's content a good focus and, even though it's short, makes it worthwhile.