I have been using realflight 3.5 for thew last four months. Under the right conditions I can keep it in a rock solid hover with under three inches of movement. But it seems if it to cold the servo don't respond, or if it to hot the heli wabbles from updrafts off the hot ground. If I take it outside at night, even with a pretty good breeze I can hold it in a really good hover for te life of the battery, about ten minutes. I just don't think it is worth 300 to get one flight in a day, if I'm lucky 3 days a week. Rather have just the sim, compromise some reality for less frustration and money. And in the sim I can fly inverted for a good 2 minutes, I feel inverted flight will never happen for anyone with this heli. That video of it flying inverted in the training video can not be with stock electronics because it seens people are having a little difficulty with forward flight without a hh gyro.