I had a Goldberg Ultimate, k&B .61, tuned pipe, 4 Klett small pinned hinges on each aileron - 16 total.

Had the club expert take it up - Flew it a couple of times - no problems. No flutter, just a little underpowered.

4th flight - making a wide slow turn, blue fluttering down from the sky. ONE hinge was still intact, the rest had BROKEN at the hinge line - NONE pulled out. Result - total reuseable parts filled a coffee cup.

Saw Goldberg at the AMA show - they backed away REAL fast, and I didn't even want a replacement of anything, just wanted to tell them about their quality control and testing. The only thing that kept them in their booth was that I was standing at the entrance to it. Hmmmmmmm

You can tear these hinges VERY easily, certainly not up to the standards I'd expect.