This is an excellent, balanced, and authoritative review of all of the channeling material from both human and electronic sources. It has over 100 pages added to bring it up to date from it's earlier edition, which has long been considered to be a classic in the field. It is a must have for anyone at all seriously interested in the subject.
Jon Klimo's book, which I read some years ago, really brought together in a pretty objective way a lot of good thinking on what channeling is all about, as well as detailing the history of the phenomenon. I'm glad to see it's available again, since my copy got "beamed up" and I haven't seen it since! ;)