PR, I'm surprised by your negative comments. You must appreciate I'm sure, that in 1929, there was no mainstream, only Theosophy and Occultism. So I'm baffled by the idea of criticising an author for not moving into a "mainstream" which did not exist at the time.
The only other alternatives to Theosopy/Occultism at the time were various branches of Eastern Mysticism, from which Theosophy was plaguerised. You could equally criticise Oliver Fox for his book Astral Projection which was heavily influenced by Theosophy, much more so than TPOTAB. But a very good book it still is.
Muldoon was an RTZ projector and he reported things as he experienced them. In particular he describes the silver cord in detail. Why criticise him for that? This is precisely why I recommended the book, because it talks about things which today have become unfashionable, but never the less absolutely warrant study and investigation. What if the silver cord is real?
Anyone wishing to study AP should also study the roots of the subject and TPOTAB is firmly part of those roots.
I didn't say it was inappropriate for 1929.
I still don't find it to be a book that should be read for any other reason than nostalgia's sake.
I'm all for mysticism, don't get me wrong, but unless you're familiar with the gamut of mystical jargon so far as to understand the common themes across traditions, this book will do more damage than good.
I think its important to consider the time we're in and the cultural perception we are habituated too. It's like saying that by modern IQ standards, someone like Abraham Lincoln would be mentally retarded. Even the most brilliant explorers can be seen as painfully out of touch when thrown into someone else's world. Muldoon is absolutely a brilliant explorer of reality, but a brilliant man 100 years ago makes little sense to the novice today.
So, bringing it back around, this is a good book to read to add some knowledge of the 20th century OBE/AP literature to your mental collection. But it's hardly practical and I wouldn't ever tell a novice to read it.
All that said, I wouldn't be able to say anything if I hadn't read it, so by all means, read the book. At least if it's of no use to you, you can tell others about your take. Plus the cover is really pretty.