This book takes a good look about Celtic Christianity, and although the author is a little critical, he brings up many valid points. I wouldn't base your entire views of Celtic Christianity on this book, but it is definitely a worthwhile read. Of course, I am a little biased, because the author was my English teacher in middle school. :)
Overall, this is a good book. Informative, but from a decidedly Protestant viewpoint. As one who is discovering the catholic Faith through the study of Celtic Christianity, I was disappointed that the author was so critical. It is true, the Roman church is imperfect, and has commited heinous acts in the name of God, but God uses imperfect things. I myself do not subscribe to the views of the Roman Catholic church, but we are One Body in Christ, and He is bringing His Bride the Church together.
The second chapter gives an excellent snapshot of the times we live in today. Chapter two is, in my opinion, what makes this book worthwhile. I cannot reccomend this book for those seriously studying Celtic Christianity. There are much better sources of study available.