I had a lot of success with FMS. But I wouldn't say it was free. It worked for me cause I had the cable to hook up my radio, the same radio I used to fly. My only goal in using FMS, was to be able to fly laps around the field. I wasn't trying to learn new aerobatics, or anything fancy. I can fly just about any of the models on FMS, and I know for a fact I wouldn't be able to fly like that in real life.