I have a G940 and for the most part, the force feedback is incredible!
When I have a control surface get damaged, it shakes pretty violently. Whether or not realistic, I have accepted this as the norm, as I wouldn't expect a plane to fly smooth and straight with, say, half a wing missing.
The "bug" part of this is when a bomber gets damaged. I was flying some Lancs and my wing got blown off. The controls started shaking violently as to be expected. However, once I "ejected" and was then flying plane#2 (which was completely undamaged) the shaking continued.
This is with Win7-64bit. Thanks!