This book is part of an esoteric mystical tradition that can even be considered such in this day and time when so many other mystical tracts are published and popularized. Perhaps this is why the small paperback costs a fortune and in this connection i would only recommend such a purchase for those who can afford this investment and who are already steeped in these issues, notwithstanding the English translation ( note: not a commentary). I vaguely recall the translators are part of a group that meet digitally regularly to review this and other esoteric mystical tracts and stated their prices reflect the mission they have to continue to invest in future translations of these type of tracts. That said i also vaguely recall ( i hope i am in error) that some of their study groups occur on Friday nights which to me somehow seems to go against the whole purpose of these books in transmitting the tradition. Again this is a while back and my memory may be faulty here.
The book itself is a straight read that will be, i speculate, largely uneventful for most readers given that one assumes the real secrets are buried within the text and not simply unearthed by the literal translation. Hence the star rating really is irrelevant to this genre and is more based on the recipient that on the transmitter.
Addendum-- follow up note-- moving ahead in time i see the price of the book has dropped considerably.