I had one on my DP extra. My right wing panel had a slight warp to it when you look down the leading edge. It was enough to bother me, so I fixed it. Since I had heard DP customer service was slow, I took it into my own hands. I tried to shrink the covering, put weights on it ect., no help. I finally did surgery! I stripped the ultracote, and fixed it right. Also found that panel was not as thick as the other! I finally have the airplane ready to go (just about), but I could have built a kit faster!