Craig,
I agree on the difficulty level. I had read the PMBOK once, studied it in detail on a second pass, and referenced it again as I went through the study guide by Aileen Ellis. I had been scoring mid to high 80's on her questions and about the same for the PrepCast questions. When I took Oliver Lehman's set of 175 I was humbled to have missed so many (got 135 of 175). I found for most of the ones I missed; his references were to other texts, not PMBOK. This forced me into new material that I had to go look up and strengthened some areas of weakness. He pushes the envelope with some PMBOK definitions however, see the Post Mortem Thread in the Exam Discussions. I missed three of these because he limited the definition of "Post Mortem" to projects terminated early. I also went slightly over the time, so thanks to Anne for posting this shorter timed version. Perhaps I can show improvement on this round! I need to receive confirmation from the last of seven references then can apply for the exam, then the countdown begins...
-Bob