I have a total of 5 minutes on the sticks with a friend's Harrier. It was way out of trim and a bear to fly. He has since set it up properly and now he loves it. My comment on the wing rock issue is not based on first hand experience, but rather what others have said on here about the plane. As for why I didn't get one, there were two big ones. I don't like the transparent covering, with the upper and lower being the same color. I was hard pressed to tell what's what on his. And the other is that I prefer side mounted 2 stroke engines. That plane asks for an inverted engine, which I just don't like. I will fly his some more this year to get a better comparison, but for now, I'm really happy with the Funtana. I may slap some tip plates on her to see if it does anything at all. If it does, I'll surely post the results.