I passed PMP exam day before yesterday. I used Prepcast Simulator to prepare for PMP. It helped me to understand how to read and answer the questions and was a good addition to my preparation and understanding. However, the difficulty level of PMP real exam was a bit on a higher side. If I had to put PM Prepcast and PMP on scale of Low, Mid and High difficulty, i'll put PM Prepcast at Mid and real PMP exam at High difficulty level. I feel real exam was more like Oliver Lehmann questions difficult level!!