To me the only part of the book that wasn't good enough in relation to the tape was the relaxing. I know relaxing sounds easy enough, but the state you get into when Paul guides you through it and the state you're in when you try to do it without the tapes are very very different. I've been doing the program for awhile now, and even though I can get in a very similar state, I still pull out the side B of tape one every now and then. Scheele is the man =)
-Ramon
PS - even though I still haven't activated the "Brilliance" book yet.