here is my 2 cents:
I tried PrepCast, PM training, Lehman 300 questions, and Rita Fast-track. The Actual exam, I passed on 23th June last sunday , was different than any simulator, However, this should not be your concern. All the well-known simulators :
1- Measure your overall understanding.
2- The answers explanations train you on how to think in the situational question, this is especially true in Rita's FastTrack
3-Test your knowledge in the ITTOs
4- Helps you in managing your exam time
5- help you practice the mathematical questions.

Congratulations on passing your PMP exam! Great to hear that the Exam Simulator was helpful.

Congratulations Candice on passing the exam!

I took the PMP exam yesterday and passed! Although I did think the real test was more difficult than the Exam Simulator exams, however I truly think I couldn't have passed as high as I did without taking the exams in the Exam Simulator. Just wanted to pass along the feedback!

Thank you, Donald! That's great information. I will dig more into the Lessons Learned forum to gain additional insight.

The exam simulator here is the closest thing to the actual exam that I have seen. I went through all the exams here, and was able to pass my PMP exam with an AT score on the first attempt.