I just finished building a Red Bull Edge yesterday and my impression of it wasn't much. Mainly on the bilding technique. No interlocking fuse parts, completely built around a tube, lots of messy glue. That hinging system is way over-engineered, tape hinges would be much simpler. The plastic z-bends and hinge clips break if you look at them wrong, good thing they sent extras. I have never glued my fingers together as many times as I did building this thing, not even building the little machine gun parts for my S.E. 5a's. I hope it flies better than it builds, 9 oz., but if not, I have some shockys on the way (just in case).