I flew 6 or 7 tanks through mine yesterday too. Construction on mine was perfect. OS 50FSR, Jr servos, 600 pack, and full length ailerons. AUW 4 lbs 9 ozs. Full deflection rudder and high speed barely holds level knife edge. Even with the huge rudder, it doesn't respond great in hover or torque roll. I'm right on the balance point now, it may get better as I go to tail heavy. Still need a push for level inverted, quite a bit of wing rock in harrior.
But it still flies great! Slows to a walk without flaps, lands easier and slower than any trainer I've seen, slows well on downlines, and gives alot of confidence for low altitude aerobatics.
I've already decided if I wreck this, another will be on it's way.