4.0

Quality. I'm not entirely sure why that word doesn't show up in the title at all, because that's a large part of this book. The idea of combining a dense philosophy book with a story of a cross country motorcycle trip seemed strange to me at first, but they worked well together. This is by no means a light read, but it delves into some interesting subjects without becoming an incomprehensible pile of words, which is impressive for the topics it covers.