I have about 5 flights on mine with a K 100. It needed nose weight to balance even after removing some of the ducting and moving the engine forward up to the fuel tank. More power than it needs. I would go for the new K70 if I buying a new turbine. Suggested aileron throws were way too high for me. I have some of my plywood delaminating inside. Thee dealer said he would take care of it. I'm waiting on a reply from Top Model. Other than that, I'm happy with the model.