It was one of his secret project books so it will be a lot less of a commitment, only 400 pages or so, but it will help you see if you like his writing style or not before moving to some of his longer books.
It is super fast paced because it is loosely inspired by Mad Max, it’s got a few Easter eggs sprinkled in from other books that you probably won’t catch but it’s not important to any main story just kind of fun for people who have read his other works.