I spoke to the owner of my local hobby shop and was told the only sim. worth buying is the Real Flight Sim. 4.0 the reasoning was that it is the MOST realistic sim. and that the others are all like a "game" and un-realistic. Is this true? I was under the impression that there were sims out there that were good that you could use your TX and a usb cable to your pc. Are these really no good?