Does it connect meditation to Jungian psychology, as promised? Yes. That part is good. One has to appreciate the connection between scientific exploration and spiritual exploration. The two are linked, no doubt.
After the initial connection is made, however, the book is terribly boring. Not only boring, but somewhat confusing. The diagrams Kelsey created could have you staring for hours. These diagrams make sense to some degree but they are not at all helpful. They don't simplify matters as diagrams are supposed to.
Strangely, Kelsey doesn't include that many different opportunities to learn how to meditate. There's a lot of talk about meditation, how to prepare oneself intellectually and spiritually, but he barely scratches the surface on methods and means. If the book were sub-titled, "An Understanding of Meditation for the Twenty-First Century," I could recommend this book more. As an introduction or exploration of meditation for the century, though, it falls well short... over many pages.