No one seems to have answered your questions fully.

I have a Weatronic RX in my Reaction 54. I would like to try the Gyro function on Ailerons (thats the way I have it mounted).

My questions are, Say you are in a banked turn, will the gyro keep the angle of bank steady? or if I am wings level on final, will it stop roll movements due to wind?.
How about during a roll (slow roll, fast roll or point roll), what is the effect?.

I will try it soon, but I would like to hear someones experience.

I have experienced the effect of too much gain on a fast pattern model. It was on the rudder and it got into a yaw oscilation at high speed if Ihad too much gain.

Any comments from gyro users on jets?

Regards