Hard going, but worth it.
I bought this book after deciding that my mental state regarding trading needed a bit of attention.
Overall, I found the book worth buying and reading, and if you like me, need to look at the psychological aspect of your trading, then you should go ahead and get a copy of this book.
But...
I must say, I found it hard reading. It took me ages getting through it. I am not sure if it was because of my reading ability, my mental state or the way it was written, but I would probably lean toward the fault being in the way it was written. I had to keep going back over section of the book to see what I had just read.
That being said, I did finish it and was glad that I kept going. If you can grasp the concepts behind the writing, you may find it greatly helps you. I think I have put off a stomach ulcer for another while :)
I have since read through some of the parts again, and do intend to go back through the entire book at least once more. I reckon that if I found it so useful after one difficult read, then the next time I should be able to pick up some more helpful mind alterations.