RE: What do ya think?
EXPO a MUST? That is pure hogwash!
A properly setup airplane does not need expo. I NEVER use it. Every plane I flew with expo other people asked me to fly scared the hell out of me. When I want a control to move I move the stick.
There was no such thing on a radio when I learned to fly. It is not needed ESPECIALLY on a trainer. Dual rates, Yeah that is ok. I seldom use those either.