if i have time, i may experiment with my git2 and my quadcopter (since a quad has PLENTY of vibration to introduce the jello effect!)
1) mounted directly to quad frame with zip-ties, gyro OFF
2) mounted directly to quad frame with zip-ties, gyro ON
3) mounted to camera mount plate (which has silicone vibration damping "balls"), gyro OFF
4) mounted to camera mount plate (which has silicone vibration damping "balls"), gyro ON
I fully expect jello effect in 1 and 2, but none in 3 and 4. that's what the silicone dampers are for - to prevent vibrations from the craft from making your video look bad.
this is similar to my camera mount plate - you can clearly see the black rubber isolators.