Having had the opportunity to meet and train with Von Krenner Sensei, all I can say is that he is a delightful person and a sincere martial artist. That said, Aikido Ground Fighting is a well-paced, thought provoking dialogue focusing on the practical application of Aikido techniques in martial situations. The book progresses nicely with a discussion of several core techniques, transitioning to suwari-waza and finally moving into the practical/tactical convergence of the two. The conclusion was thought provoking, with a focus on the authors' philosophy on Aikido training, as well as his interpretation of what O'Sensei's goals were in developing and promulgating the art. Perhaps not the best place to start for newer aikidoka, but thought-provoking material for the more experienced. Highly recommended reading.