Flying a cockpit simulator as a training aid of RC flying is not a good idea at all. Although the principals are the same, flying RC from the ground, and flying in a cockpit are two completely different experiences. Having said that, the RC flight simulators are a great training and practice tool. With the better products, the simulator experience is very close to actual RC flight. I use mine for practice whenever weather conditions or whatever prevent me from going to the field. And, you do need to learn to use the rudder. True, many planes can and are flown alerion-only, but for solid flying, you do need a bit of rudder for a lot of manuvers, especially in you landing touch-down, whne alerion control only is a crash just waiting.