Back to your previous question, one of the differences between the fixed wing and heli radios is the throttle stick. On heli radios, the throttle stick does not have the "click" feel, it is smooth from idle to full. There may be other slight differences, but that's one that I know of.

A lot of the radios have both fixed wing and helicopter memories that can be switched in and out of either mode, even if it is a "heli" or "fixed wing" radio.

Your decision to just hold on and wait until you really need to upgrade is a solid decision. Technology changes as do the radios as they release new model radios. When I bought my DX7, it was state of the art. Now, today, there are several that are superior to that radio, but at a substantial cost difference.

" I would only buy Futaba, or Airtronics, or JR, or Spektrum..." are the answers that say nothing about the radio in question. You are doing the right thing by asking questions and making informed decisions.

And as to the modules, well, they are manufacturer specific. You cannot interchange a JR module in a Futaba. The technology is different and proprietary and won't mix.

Best of luck!

CGr.