The simple answer is that the orange receivers only just came on the market and most of us hesitate to recommend something we have not tried personally, that is all

As for the surface vs air - as I recall the receiver I have might well have a telemetry function which is not supported by the air radios - or something, either way I have a Spektrum receiver here that does not talk to a DX6i - that much I am certain of, so I guess all I'm trying to say is be sure to read the small print before you buy (unlike me... [:@] )