I'm only part way through this book, and granted it is somewhat dated at this point, but I do take issue moreso with the structure and layout not so much the content. I bought this book with a flavor already for the transpersonal but having not read (at least I thought) many books directly addressing transpersonal. I'm also a licensed counselor looking to have concrete education on this topic to include a more concrete model in my practice. What I found was not only a book, that although it draws from various pioneers, reiterates a ton of Ken Wilber. Ken Wilber I have read a moderate amount and am very fascinated by his ideas. However, if I wanted to read Ken Wilber I'd just read more Ken Wilber. Secondly, this book bounces all over the place without clear direction of why the author is guiding the reader into the territory of content he is laying out. This added up to a fairly confusing read for someone trying to learn. The author jumps into information with a large assumption that readers understand various concepts... Leaving some things grossly under explained. I think a revised and updated edition would include at the very least updated Ken Wilber ideas, clearer direction, and more explanation of concepts and ideas. It almost makes me want to put the book down and go read more Ken Wilber and/or more about the authors he mentions. This book should be entitled "the history of transpersonal"