I read this book two years ago and it told me that the reason I was using drugs was that my needs weren't being met. I tried to do what it suggested to get my needs met but, of course, as an addict my needs are never going to be met. I'll always want more, more, more. So I started feeling very sorry for myself. Then I got into a spiral of self-pity and was soon using drugs and drink more than ever before.
The authors have good intentions but they don't seem to understand addiction. Their theories are just academic. They sound quite reasonable but they don't seem to work. At least they didn't work for me. If anything, their ideas only helped me to stay sick.
Since then, luckily for me, I've found another way to recover that (so far) seems to be working.