I had an RCM Trainer 40 with a Thunder Tiger .46 Pro on it. It was a snotty trainer in comparison to the others at our club. She would fly inverted, which was beyond most of the others. A .46 in the Avistar is a good "hot" trainer, also.

Mine might still be flying if I hadn't got kocky and tried to fly it in the spring from a short field (a boat launching ramp) in gusty winds - with the rudder trim having accidently been shoved full left. Took my eyes off her to reset the trim adjustment and looked up in time to see a smoking hole. *sigh*

Tip #17: If it acts squirrely on the ground it won't get any better in the air.