I've had Realflight 3.0-4.0. The one thing I despise about RF, is the UNREALISTIC ENGINE PERFORMANCE built into the motors, especially OS Motors. Since when will a 46fx run 16,000 rpms with an 11x6 or 11x7 APC? or a DA-50 Gas engine run 30,000 RPMs? BALONEY!! to put it nicely. "Get what you pay for?" you say? I don't see that I got it.