Of all of the grimoires that I've used, this one seemed the most incomplete and difficult to work with. The seal of Venus alone was... a pain. I had to redraw it several times and for not a lot of success.
My results with it were mixed. I worked through the spirits (inasmuch as the conjuration and missing information allow you to) and really only managed to get a solid response from one of them. My student, on the other hand, had better responses from multiple spirits, but also expressed some difficulty in making contact with the entities.
Has anyone else here had better luck with it? Or, am I missing something? And, just theoretically, do any of you think that Turiel is part of another grimoire and, if so, which?