RE: Futaba 7C question?
The advantage of having digital trims is that they are disabled when you are not using the transmitter, that is when the power is off. Also they keep the trim changes in memory so that you always get the last trim setting for the model you select. This is my first season flying with digitals, would never want to go back to old style ever. That said, I feel that it is very important to have a dedicated throttle kill switch on a Tx with digital trim on throttle, the JR 7202/DX7 use of digital trim for throttle kill leaves much to be desired, as it's not instantaneous.
Pete