Well, I'm glad I finished the series, but saddened that I didn't come away with the insights I was hoping for. All these books are great at providing the background and development of their respective religions, and at distinguishing them from related ones, but don't provide enough detail about the specific rituals and practices to give you a deep sense of how they operate. For that, I suppose, you have to attend some of the services yourself.
To put it more succinctly, these books provide a wealth of information about *how practitioners think and what they believe*, but not enough about *what they do*. Still, if you're interested in religion, they serve a significant purpose, by providing you with a detailed context into which to place what you later learn as you pursue your studies. Indispensable for those who are seeking or just trying to understand the psychology of religious belief; dispensable for those without such inclinations.