I'm going to refrain from giving this a star rating.  I read this book as part of the curriculum for the AODA, and it's interesting as a part of the Druidry revival's history.  Nichols founded OBOD, a significant contemporary order, and he has lots of interesting things to say about various Druid leaders that came before him; as a text that is part of Druidry's history it's an interesting read but it is not a good source about history.  There are definite issues with accuracy, and lots of totally unfounded speculation; while some footnotes are present, many ideas are simply stated with no references.  I think the contemporary audience who will be interested in this book is very, very limited.