This is a good novel but I don't think it was one of Shaw's best - but not one of the worst either. I have just reread it after about 16 years and it was enjoyable but I did have a problem suspending disbelief in some of the ideas. Maybe I am just getting older, or maybe I have read too much popular science, but sometimes you read something and you say "that's impossible!". If you believe in dualism (mind and matter) and some kind of god then you will be more willing to swallow the ideas than me. I suppose the truth is that I am more of an atheist than I used to be. I believe that the mind is a product of the brain, i.e. there is no separate non-physical entity called the soul. If you believe that strongly enough then one of key ideas in the book is undermined. However, I am able to enjoy fantasies, like the film 'Heaven Can Wait', for example, but I prefer SF to be a bit more believable. But then, I'm an artisan, not a poet (an in-joke - if you've read the book). In summary, as with most of Shaw's works, a book full of fantastic ideas and an interesting main character. Good entertainment and an easy read.