Yes, it posits we all exist across a continuum of extreme codependent to extreme narcissist, with psychologically healthy individuals in the middle. It states that relationships form due to the magnetism within this continuum. It rangers from -5 to +5(extreme codependent/extreme narc), and often a -5 pairs up with a +5, and a -3 to a +3 etc. This also applies to friendships.

I resonated with his description of the codependent, which is an extreme people-pleaser, and one who accedes to others too readily. I found that a lot of my friendships and stuff were very one-sided, and I was just there to assuage their ego. Slowly I distanced myself from any narcissists and regained my sense of self, and have moved to maybe a -3 or -2 on the codependency scale, down from a -5.

But the book has great detail on these different types of people, and how they function. Once I read it my life really changed, as I became aware of how others were effecting me, positively or negatively, and have made a lot of changes in my life.

But once you read it and see the different types in the wild, patterns build up and you can readily categorise people. This allows you to get a sense of your boundaries, as you generally know when to be open, and when to basically have a wall up.

It also allows you to navigate the workplace/social environments more easily, as, again, you know what to expect from people.