The author covers every aspect of Kurdish life, especially religion quite well. The book is a good approximation of the country studies available from the library of congress on the various recognized independent states.
Since Kurdistan is not recognized as an independent state, it does not have a library of congress handbook. As a replacement, Izady's book is a good substitute.
There are a few difficulties and inaccuracies in the book, but given its size and its attempt to cover such a long span of history, these mistakes can be forgiven. For example, the claim that Armenian King Tigranes II The Great was of Kurdish origin is at best very debatable. The King is a central figure in Armenian history, and Izady's initial words seemed to be aimed at attacking Armenian history. But he quickly repairs this potential point of contention and clearly points out that the King probably regarded himself as an Armenian whatever his origins may have been.
In addition to bringing to life history that is treated as a taboo subject in Turkey, Iraq and other Middle Eastern and even some Western states. Izady does a great deal to shatter the image of religious conformity in the region. We learn of the Yazidis, the Cult of angels, the Alevis, the Syrian Arab Alawites (Nusayris), and other groups including Kurdish Christians.
This book is a must-read for every United States Middle Eastern policy maker, because it draws a clear, accurate flesh and blood picture of a people long-maligned, massacred and misunderstood. Every American analyst interested in learning more about the Kurds, their life, survival, tragedies and triumphs should read this book as a introduction to this remarkable nation.