Please let me start with the fact that I have been practicing aiki arts since 1995, and I read a lot of martial arts books. Now with that over with, on with the review.
The aikido world desperately needed this book. What Mr. von Krenner et al did was argue that aikido IS a viable self-defense martial art. In order to be a viable martial art, you have to cover a range of self-defense aspects. Aikido can do this. Without insulting anyone, he describes how aikido has strayed from its original intentions and principles. When amongst fellow martial artists, and I say I do aikido they almost always go on to tell me how it isn't a real martial art, how no one in MMA uses aikido, so therefore it must not be valid. With this book, your aikido training can begin to go back to O-Sensei's aikido, where he was able to defeat all comers. Which meant he had to be able to perform aikido in all sorts of combat ranges, and indeed, even on the ground. He could still use aiki principles, just in a different way. This book describes the core principles of aikido, and then describes, and gives examples of, how to use them on the ground.
If anyone wants to make their aikido a complete martial art, or feels that they loose their abilities when out of their aiki comfort zone, PLEASE get this book. I cannot praise this book highly enough. There are only two criticisms I have. The first is one I've found in almost every martial arts book or magazine article ever done. When they show or describe the movements, the pictures don't do what I consider a good enough job showing what is occurring. Aikido is a dynamic art, so showing movement with still pictures is difficult I know. But this is new territory for most aikidoka (or aikidoists if you are so inclined) so perhaps some better picture work would have helped. The second complaint is that this is not a book for beginners. You have to have a decent knowledge of aikido before this makes sense. Nowhere do they actually say that this knowledge is required to fully make sense of this information. However, these are easily looked over flaws, and anyone how studies aikido or other aiki arts and wants to re-establish the martial aspect of the martial art should get this book, and subscribe to it's advice.
Jaredd A. Wilson