Hello Pierre,
Firstly, I am sorry that I couldn't get back to you earlier. I stopped using this forum after getting the PMP, and somehow I didn't receive notification of your questions.
I would say that the simulator is on par with the exam. I only got one or two questions that required a calculator. I think the exam questions distribute as indicated in the PMP exam content outline (Initiating 13%, Planning 24%, Executing 31%, Monitoring and Controlling 25%, Closing 7%). I noticed that similar questions were repeated to validate if the exam takers answered the questions correctly or by luck. As for your question regarding my scores on the simulator, it was about 75% with ITTO questions and about 85% without.