As an amateur philosopher I loved the first half of this book. It convinced me that ethics could be approached with the same rigor as analytic philosophy. Parfit's style of building a case slowly and methodically, then suddenly ending the chapter with simple statement of thesis, took me awhile to get used to, but I learned to expect these abrupt chapter conclusions. This tendency toward abrupt conclusions was amplified in the overall structure of the volume, which for me rushed to thesis statement at the end after such a long, methodical, and enjoyable buildup. I'm excited to see if the second volume offers more space to explore the ideas that ended volume one.