I bought the trainers as planes for friends to fly at the field. i would not DARE let them touch my 1/3 Christen Eagle, or my 1/4 Taylorcraft. I am the type that likes to NOT bring a charger to the field. I get roughly all day flying using a gallon of gas and still have flight time left with my larger batteries. I dont cut corners. Ohhh yeah, I forgot, reinforce and brace the firewall That MUST be done. But the MDS was a pain in the neck. I went through a few. They quit in air. Once I slapped on a OS 65 it was no problems. Overall it is a GREAT plane. needs upgrades