Futaba vs. JR
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Well, having used JR's and Futaba's systems for many years (and with no problems), I must say that the buddy system with a 9Z as a master is leagues above ANY system I have used. You can set it up so that any input from the master overrides what the student is doing, but you (the instructor) don't have to stand there keeping a switch engaged.
And all JR radios do not feature a trainer function, either. The 10X heli radio doesn't, which is why I didn't buy one. The 10X plank version might, I dunno. But wait; oh, yes, the comparable top-of-the-line Futaba radio has a trainer function AND software for all different types of models.
They (Futaba) did err when they made the trainer plug for the 9C square instead of round. A new 9C owner must buy another cord if he wants to use the 9C in a training capacity. I guess this is what you're referring to?
Steve