I wouldn't say Thanks! is particularly deep or insightful and it doesn't cover the 'scientific' aspect of gratitude and how it affects humanity etc. It uses a lot of the anecdotes, which I'm not fond of, though for a book on so subjective a subject there's little else to do. As a Christian, I find it odd to say this, but for the kind of book this is, I was surprised by the emphasis on Christianity-related gratitude a little disconcerting--perhaps because it purported to be a scientific analysis. That's something I can see turning off a lot of readers.The advice chapter, the last, could be useful to many, if it's followed. Again, not original or deep, but no bad either, and Emmons is a clear writer and easy to follow.