I own 3 RC sims . RealFlight 9.x , Phoenix 5.x and FSOne . If I could take back all my money and spend it on just one sim it would be FSOne . Its simple to connect virtually any RC transmitter to its USB interface . There is a good selection of planes ( and helis ) ,where the physics of flight for each craft is individually calculated . So ,for example , a flat spin needs a significantly different set of transmitter inputs for each aircraft. As does each aerobatic maneuvre. The interface where the different variables are set prior to flight are intuitive and straightforward . The documents are very good. The lead developer is active and very responsive on the main USA based rc forum. Visually the aircraft , sky , clouds are very pleasing . There are recorded lessons by leading RC pilots and instructors . I could go on, suffice to say FSOne seems to come closest of the three to imitating the behaviour of RC planes at the field and is an excellent teaching aid.