Let me start by saying that I have had some extremely nightmarish mind-states in my life that I would never wish upon anyone. I have been diagnosed with multiple anxiety disorders and have experienced many abnormal symptoms as a result; depersonalization, disassociation & derealization being the most unendurable & uncomfortable. Not much ever seemed to help. Therapy just kept me at a standstill and drugs & medication only exacerbated the problem, sometimes to extreme limits. One thing that I have learned is that there are no quick fixes and the mind is an incredibly powerful thing. Something that is very hard to accept is that YOU are your problem, and the enemy is your mind. The only way you can fix it is through manipulation of your own brain. When you have panic the thought of letting your guard down against it is terrifying, but that is exactly what you have to do. There are few aids to help with this; to fight panic it's really all on your own shoulders.
So leave your preconceptions at the door; this is no miracle book. However it is the most helpful book I have found when it comes to panic and other all-encompassing forms of anxiety. It recommends a paradoxical mindset to approach your life with. I feel that the author did a good job explaining his idea but went about it in a very long-winded way. The good part about this is he covers many aspects and the book is not lacking in information, however much of it is repeated over and over which was annoying to read.
I'd recommend it to anyone struggling with anxiety disorders, but remember that recovery is a very long road and you can't expect instant results.