This book contains numerous quotes from famous personalities and sutras. The commentaries / explanation is in plain English. The layout is such that similar ideas (or at least in some areas) are group and presented together before an explanation is presented.
To me, reading this book is like having a glimpse of key ideas in many other well-known Buddhism texts. Many thanks to those who have made this book available.
this book is solid. great translator of a great text with a great teacher giving a great commentary. this level of instruction is usually reserved for a more direct teaching situation, and without that you may find much of it uselessly vague, abstract or confusing. maybe not. but for those who do have some experience in this realm, it should give you a wealth of helpful information. especially those interested in the gaps and bridges between mahamudra and dzogchen. for a more abbreviated version of this same teaching, by the same author (karma chagmed) see chokyi nyima rinpoche's "union of mahamudra and dzogchen," incidentally done by my favorite translator!