Has anyone given this BRP monograph a try? If so, how different are the BRP rules it uses from those as found in CoC? (Or how much more of the yellow book does it use than CoC?) Can the monograph be easily used ("straight out of the box") for non-Mythos spy games? Or is it very tied to its take on the Mythos and thus needs a lot of work to say run three or four games of non-Mythos spy games before something Mythos creeps in?