...While not the best book I've ever read, it is a good contribution to the alternate history genre. I do, however, find some fault with the closed time loop logic used as part of the plot line here.
I found the characterizations very real, but the historical name dropping (guest appearances by Janice Joplin and Bill Graham of Fillmore fame to name a few) a little annoying, but relevant nonetheless. I was a little older than some of the characters in the story during the time described and I felt that the characterizations were a true amalgam of the real Hippie movement of the time. Many genuine spiritual entrepreneurs were being replaced with monetary entrepreneurs by the late 1960's.
Chiron's message to the generations preceding him is also based on truth. It indeed will be a tragedy if we do not learn to use our technology to preserve our planet, not under domed preserves, but as a whole.
This is where I have some dissatisfaction with the book. If the story is to be a call for moral and ecological awareness, the message is not strong enough. The theme is found throughout the book, but is not brought out fully enough. The time travel tenets seem borrowed from an early Sci-Fi story, which I can't recall fully at the moment, and are not fully adhered to. I have a logical problem with someone being both a progenitor and an ancestor of themselves.
All in all, the story is a well written fine read and I recommend it to all who enjoy some mental exercise.