If you're interested in this topic, I'd recommend starting with Martha Stout's The Sociopath Next Door rather than this book. The problem with this one is that it's more "Follow me as I delve into this crazy world and have surreal experiences" than it is a study of sociopathy. And that ultimately makes it less gripping. I remember clearly the first section of of Stout's book, as it took the reader on a tour of one man's mind as he faced a simple but telling moment of moral decision-making. It was so suspenseful and kind of harrowing. This is much less profound.
Nonetheless, it's a genial read and certainly a good book.