I have built planes for more than 25 years. I had a problem with my first u can do. the right aileron just blowed away during the second flight. The cyano hinge failed, it has a 3 layer structure. the center layer it seems to be like a polypropilene material and the two layers on each surface seems to be like a porous composite. The issue was, layers separation causing that the aileron get separated in fligh. The only retainer was the servo pushing rod and the result was a broken aileron, broken servo suport and broken ribs.
I sent a report with pictures to GP. The answer was "buy another one". Not fare in my opinion. My recomendation to medelers is. Do not use cyano hinges. those are not reliable.
after couple years I got a second UCD. This time my wing is not aligned. When I put the wing in a flat surface it has a differetcial of 3/4" betwen each wing tip. I used a protractor to see if the deflection is at least symetrical and there is a 2 degree "gap" betwen tips. This time in order to fly it i need to use trims on the aileron. There is not other way to make the plane to flygh straight. i am disapointed about UCD. I love it it is a nuce looking plane but at the end of the day I have invested twice with poor results.
If someone wants to see pictures of the deflections please ask and I can provide the pictures