Cant speak for the balsa USA one, but the flair one flies GREAT! one mod i did, was to have the axle ROTATING with both wheels fixed to the axle, this stops the errant swing on take off, i soldered tube to the axle, (made it at work, i am a lather turner) give it a drop of oil now and again, and it works a TREAT, model is superb and capable of some interesting stunts, how about flying in a heavy wind, doing touch and goes? nothing special there, right? well, it touched, went BACKWARDS open the throttle, went FORWARDS, and touched again, after 10 of these, back to normality, this was on a beach, with acres of room, the rudder is powerful, and i ripped out my sternpost once got it down ok though ( i like flying in wind) ailerons are set up with a lot of differential, power in my first one was a zenoah 22, just enough, power in the second will be the MVVS 160, i love the thing, wont be without one