I got my copy of the Clavis Inferi today.
I'm happy to say that I am not disappointed. In fact as someone that relates strongly with both St Cyprian and the Angel Metatron, this is basically Grimoire heaven. I also am an advocate of the use fo specific angel names to bind demons with, as in the testament of Solomon and Dr Rudd's Goetia, so I love the circle that is protected by the four Demon Kings in Noble and Animal form, bound by the four cardinal angels.
The book is short, only 96 pages, but the plates are all in color and contain some of the most striking images from any Renaissance Grimoire. This is really great stuff.