I haven't had any structural problems with their airplanes but I can tell you that they are not the highest quality arfs available and not real fun to assmeble. I only flew my 67" Extra about 10 times before I retired it. It had a real bad tip stall and the covering was coming off. I reinforced everything I could reach as I was building it, but I'm still not confident of their quality. I am donating it to my club.