The biggest gripe with RF as opposed to AFp is real flight will only take so far. What level of flying are you leaning toward or is general control inputs and minor knowledge of the plane all you are interested in? After you have answered those questions then get your sim. PilgrimChimp is right, but some people could care less about real flight physics when there only looking to putt around the field and do some minor aerobatics. Any of the sims will do. Then the only thing to worry about is price and for that AFP is cheapest. But, If your ultimate goal is to get into 3D and be extreme. There is no better tool to learn on than AFP its the best IMO best flight physics for a plane that thrives on no forward motion and can still do manuvers in a stalled state. Real flights physics cannot decipher what to do when the plane has no air flow over the control surfaces. Again I say IMO. But then there is the release of RF G3 and suposedly they fixed all that. Now the only problem is you have to resolve yourself too is flying Greatplanes planes through out. Every adaptation of any plane on RF is a version of a Greatplanes model.