If a flight sim or flight game is what FMS users wanted, there are simply too many graphically better, considerably more sophisticated equally affordable alternatives to FMS for it to be the product of preference.
For what it is, an R/C training tool, FMS it is quite good....and the price is perfect.
FMS has definetly helped me to become a much better pilot. I was slaloming trees today then i hit one and bounced straight backwards. It's fun to clip trees with it too.