I used Becker and Wiley and felt comfortable with the simulations, they are a great reinforcement of your overall knowledge.
The actual simulations I got were nothing like my study materials. One topic was mentioned breifly in a few sentences and the other was just ambiguous. I still don't know what they were asking exactly.
I don't know my grade yet, but hoping I did well on the MCQ because they must carry a lot of weight from what I've read. If you understand the MCQ, you can wing it through the simulations from my experience. Good luck!
REG - 75 (expired, retake July 2011)
FAR - 69, 64, 67 <-Becker, 80 <-Yaeger
AUD - 82 ETHICS - 100
BEC - 72 (retake May 2011)