I have bought two in the last year. The first had no problems. I was fairly vigorous with it without any problems but try to fly scale. The second awaits its maiden. I believe it is a matter of carefull wing joint but those who had a problem may have had OEM production flaws. Who knows. Great model though and flies beautifully. Strongly suggest you go for it with O.S 91 surpass with Pitts muffler. Looks very fine in the air too.