I used a PC based simulator several years ago and flew RC helicopters like the HoneyBee. The simulator saved me a lot of grief especially when developing reverse control proficiency. Fast forward to now. I purchased a Hubsan 107l and was up and flying inside with considerable success. However, my reverse control proficiency had gotten a bit rusty. Thus I purchased this app as it has a quadcopter model and boy did it help. I must admit i enjoyed flying the fixed wing aircraft as well. I highly recommend it as an iPad app.
Joe Bert about Electric RC Sim