Firestorm actually has a very valid point. How relevent is HTBJ today in today's modern aircraft?
I knew the author (who is sadly no longer with us) and I am sure that he would be the first to admit that the new generation of jet aircraft have had most of the horror stories designed out of them. For example, it is extremely difficult to get my present aeroplane to Dutch Roll.
However, any true aviation person should be a constant information seeker and I agree totally with 411A that this book is a MUST read, even although you are unlikely to fly an old water-wagon 707.
The fact of the matter is that it is always the bizarre and the unexpected that kills people so, if you have read Dai's book and your "perfectly designed flying machine" starts to do unusual things, then you might just know what to do next!