The Diamond Sutra is the core of the Buddhist Mahayana tradition and displays the paradoxical and mystical nature of Buddhism. Mu Soeng has written an extraordinary book for Buddhists and non-Buddhists alike. It is transformative for readers from almost any spiritual tradation, and the most articulate and absorbing commentary on the Buddhist Mahayana tradition as well as the Diamond Sutra. Thich Nhat Hanh's commentary on the same sutra pales by comparison. The book's first section is the most elaborate and remarkable exposition and history of Mahayana available in a popular text. Mu Soeng places both Buddhism and the Mahayana tradition in the historical and cultural context of the times, showing the remarkable creativity of the Buddha's views. His exposition of shunyata or emptiness is as close to human comprehension as we are likely to get.
Bowing to the two previous reviewers, I will add these few words.
If you want to know more about Prajnaparamita thought and practice than this book undertakes to explain, then you are in for some serious reading of very thick and mysterious books (commentaries on sutras), supplemented by no small amount of meditation practice. I hope that you will 'go for it'. Until then, Part Two of this book will serve you well.
The Part One is the real find, however, delivering a marvelous digest of the most recent scholarship of the history and analysis of the origins of Mahayana. Your simplistic distinctions go out the window, with no regrets. Most every Mahayanist will learn some new things here.