I was looking on Amazon and that book is $4.99 right now so I bought it. I read thru it and I must say it is as bare bones as you can get. I liked the book, but it uses eleven demons from Ars Theurgia Goetia. I know they are aerial spirits but it does not say much else about them. I've searched on here and there isn't much on here about them either. I hope to be able to report on this book before too long because I am going to try it. I was just looking for any experiences or opinions on the spirits in Theurgia Goetia vs the 72 in the Goetia. I know I have read elsewhere that the spirits in Theurgia Goetia are both good and bad.