I have been reading around the subject a lot, and was very impressed with this book. I am not an expert on the spiritual / religious practice dimension (which is why I am researching the subject in the first place), and I found Filan's style accessible, fluid and clear. The discussion of the historical, political and cultural aspects of vodou and its evolution were most enlightening, and grounidng existing practises in the social and evironmental context of the present day (touching on such issues as poverty, deforestation and the experiences of the Haitian diaspora in the West) made the book feel relevant and current. Not many books on the occult would contextualize the subject in references to Maslow's Hierarchy of Needs or Rousseau. The introduction to the lwa and the rituals of vodou and the comparative religion aspects of the text are also very helpful to someone researching the subject from scratch.
If you are intereseted in this fascinating religion and its practises, this should by no means be the only book you read on the subject, but as one of the introductory texts it is clear, lucid, intelligent and helpful.