As far as learning to fly advanced planes such as scale, pattern, or any low wing type of aircraft, and even helicopters, with the non buddy-box teaching method I use, I can easily help almost anyone safely and quickly with the transisition.
So, after a couple of hours (one day) of me instructing someone on a trainer, it is rather easy for my students to get familiar with the flight characteristics of any type of low wing aircraft.
Ironically, they say that the low wing plane is almost easier to fly than the trainer. I have several low wing planes that I will let anyone fly, even if it's just for the experience.
Take care,
CCR
http://www.kites.org/rc_instructors