Quite interesting to read this, coming from a psychological background myself (both as a client in psychotherapy, as well as a Bachelor's graduate in Psychology).
I personally have tried out Cognitive behavioural therapy myself, and I find it really useful. The way the author explains the few practical methods is great, it's easily applicable and doable on your own. I found it helpful for myself already when reading the book.
What I didn't really like is how chaotic the book often was, and some things made me see the author of the book as that typical (as seen in movies) ethereal cali psychologist, having all kinds of weird personal beliefs. Some things made me raise my brow a bit, but maybe that's just me.
I wouldn't say this goes in the highest usefulness shelf when it comes to self-help books. However much I am drawn to CBT, this book left me wanting a more in-depth walkthrough of the therapy, its theory, etc. I know that this is intended for an average joe reader. But if you can go deep... go deep :)