I highly recommend this book. It took me ages to read this book, not because it is a very long book, but because what was in it made me often stop reading and pondering philosophical the concepts the author was putting forth. It made me do lots of pondering between paragraphs and the like (and for this reason I easily lost my place). I was in hospital at the time and found it be a great spiritual support in a very negative environment.
Certainly, what is presented here is a spiritual classic - the author goes through many topics, in particular I found his explanations of reincarnation and karma to be very insightful and gave me new perspective on these ideas.
The book also has some charming and fascinating ancedotes about Ram Dass life with Baba and his adventures in meditation - I found the story about his meditations with the Zen masters Koan very entertaining.
A book writetn with great wisdom and humility from a modern spiritual master. If you are just a little bit interested in these topics - I'd highly recommend this book.