Kudos
First off let me assure you that Mark Douglas deserves all the generally positive reviews he's received for this book and for "Trading in the Zone." What Douglas has to share is essential, extremely valuable information for both aspiring and veteran traders alike. That said, stand warned that Mr. Douglas has quite a tedious writing style. He suffers (and thereby, so does the reader) from a particularly diffuse, circular, and repetitive style. He gives redundant a bad name. Here's a sample, you be the judge:
"Our committed expectations about the future will act as a force on our perception of market information to control its flow into our mental system in such a way as to avoid a confrontation with anything that doesn't conform with what we already believe is possible." Got that? Then this book is for you.
You don't have to worry about picking between The Disciplined Trader, and Trading in the Zone - Mr. Douglas is so repetitive that he essentially wrote the same book twice. Material from each book is either reprinted verbatim or repeated in a slightly different way in the other.
In fairness, Douglas is struggling to convey some very complex psychological concepts which don't easily distill down to catchy one-liners. Still, for all of his good things to say, Mr. Douglas would only benefit from a good editor.
Stick with it though - the keys to success are buried within. And then re-encrypted over and over.