It's simply a good book that gives a model/framework for self-improvement and how attraction between men and women work. It's still a model, it doesn't apply all the time, but it gives a certain insight and lets one see patterns whereas before, one sees only this behavior and that behavior and has problems to connect the dots. It is a model to unlearn (or at least: put into perspective) all the other models you learned about flirting in the past (mainly bullshit flirt guides, advice from girls, and Hollywood movies).

I think it's more than that, it's also an amazing story. It's not just another book about self improvement.