You don't have the environmental feedback you have in real conditions. Like wind direction and speed, sun position, real life position indicators. Overhead perception, depth perception, etc. Good for stick control practice. I use RF 7 and I'm shocked by the lack of variety of plane-power combinations. If you want small or super large it's there. If you want planes, engines, & prop variety in mid-range do a software comparison first. I don't know about other products but RF has the ability to change a lot of factors but not much info on the effect and how to adjust. For example: want a 30 cc size plane? Not much to choose from. But, if you scale down 100+ cc plane what else do you have to modify?