A couple of points for you. First, we [Futaba] will have an adapter that allows the CGY750 to operate with non-Futaba/non-S.Bus receivers (not a satellite thing). We hope to have this in stock about the same time as the CGY750.
What you will lose by not using a Futaba system is the ability to set all three gyros up using your transmitter. You'll be doing it from the CGY750 itself. It is certainly not hard to do, but an extra step. There may be other considerations, but I'll have to wait until we get the first prototypes to answer those questions.
As far as the CGY750 abilities...yes,it really is all it is being marketed to be. Just ask Kyle Stacy, Bobby Watts, Matt Botos, or Brian Bremer.