I built my UCD in January and have spent half the summer flying it. Although I'm not an accomplished 3D pilot, the UCD has it's strengths and weaknesses. It's an awesome slow flying aircraft and one of the best hovering planes I've ever seen or used. It's very forgiving and can land like a trainer if you want it to. Some of the things it doesn't seem to do well at are Knife Edge and Harriers. When I try to KE the plane tucks to it's belly and rotates. I haven't had much luck mixing it out. And when I get the plane in a harrier it rocks back and forth pretty violently. Now as I stated above I'm certainly no expert, but I've done better harriers with other planes. I've got a rearward CG at 6.25".I need to keep practicing, but as of now those are my main flying concerns.

As for the structural integrity mine has been really good so far (cross my fingers).