Frater UD's best book is without question Sigil Magic. This book seems to have a lot of information in it on practice not theory which in theory sounds good but not so much in practice lol. I find UD's writing style to be a little annoying at times, and pretentious, in that at times he seems to use multiple levels of abstraction to discuss something without just telling you what it is in a few direct sentences, like he enjoys 'the sound of his own voice' without concern for the effectiveness he is conveying information to the reader. The chapter Folk Magic III on doll magic is actually only 3.5 pages as the later sections in that chapter have nothing to do with doll magic whatsoever, so it is misleading and likely a result of poor editing. So yes I would probably recommend it, but on the strength of this book I won't bother buying High Magic (I) as I found Stephen Skinner's book Techniques of High Magic to be less full of waffle and with more background. Also the idea of UD's to include many different styles of magic for chaos magicians interested in ceremonial magic, sigil magic, evocation, folk magic etc. is ok but it omits many other types of magic that might be of interest, e.g. psychic vampyrism, reiki etc. It could also omit some of the historical information about the organisation of the HOOTGD which doesn't really give you the theoretical background of the ceremonial rituals.