Many working occultists view this work as beautiful, but shallow. I think I can show that the truth lies a little deeper than that.
First of all, Mathers only worked on the most useful texts when resurrecting works of the past. Why then would he have spent so much time on this volume? Why would he have held this piece in such high regard, when so many other manuscripts remained outside the reach of the average occultist?
A piece of the answer lies in the heavily veiled sex magic couched in the ambiguous descriptions of "The Visions".
I direct you to the vision of Gimela, for case in point:
"The Beholding of the Serpent that tempted Eve."
The Visions make up a large part of the content of the text in this piece. These visions are revealed by virtue of the proper use of the seals, and are described in detail. That makes this a rare manuscript on the act of Mandela Meditations in the Western Tradition, and the oldest recorded use of "Path Working" we have. This inovation (path working) is often credited to the Golden Dawn. Clearly this is a mistake. This book suddenly becomes much more ground-breaking, when viewed in its historical context. I will grant you, the Christian bent of the text puts the tradition at a relatively later date than the Goetia, and many of the works attributed to Solomon.
Another facet of this literary gem is the spirito-historical context. Almost every spirit mentioned in the text is put in context with Biblical personalities that the reader would be familiar with. For example:
"Gabriel, the spirit that did teach the Prophet Elijah the Mysteries of Divinity..."
It is an exhaustive laundry list of "who did what" from the Fall to the Crucifixion.
As for the actual evocation and banishing portion that gets so much flack, hey, you can find the same format in dozens of other books, but do yourself a favor and don't throw the baby out with the bath-water. Anyone exploring the rich tradition of Western Occultism should give this volume a good look.