I give this book 5 stars because in my mind it is the most well rounded book on Ogam and Ogam divination available today.
Mr. Mountfort puts forth a scholarly study of Ogam including history of, his interpretation of, making of, and casting of Ogams.
What struck me the most about this book was his painstaking effort to link for us the individual meanings to thier corresponding myths. Along with this he also at no time gets bogged down in the dogma of right and wrong when it comes to interpretations and makes it clear that the study of Ogam is an ongoing evolution and today's reality may very likely change as time progresses. What is important is that IT WORKS!
Lastly, he takes us through the recent revival of Ogam and gives us his views on modern publications pertaining to Ogam.
All in all, an interesting informative read.