The perspective of being able to debug your own brain is invaluable and understanding other methods to do the same are worth the price of the book.
Buy an electronic and paperback. Great book.
Namely, that your mental health is part of your body, not part of your mind.
It really changed my perspective, where before I had contempt about my body, saw it as a nuisance, I now understand I -am- my body. It's as much a part of me as my mind.
It helped me look into the right direction for treatment and additional resources.
There were parts of my behaviour that held me back, but I thought were crucial to my identity so I was reluctant to let them go. After I realised that they were symptomatic of psychological injury and not part of my fundamental identity, I allowed the change to happen.
It felt more like going through a process of healing in the same way that I might treat a muscle strain, and not spend the rest of my life limping because of a bad fall.
I realise that sounds a bit contradictory - I guess the idea is that my mind is part of body and can be treated as such, which makes it necessary to liberate the ego from the rest of the mind. It made the concept of mindfulness finally click for me.