Also please make sure it's going the correct way, and you have the gyro on the correct axis. I know it sounds like common sense but Im paranoid and I check i my planes before I start after the gyros have had a chance to start up. I have seen planes with the gyros on the wrong axis take off and go wild. You just have to double check your work, if you get it wrong it will be pretty exciting at best, crash at worst.

I don't have a flash, but when we started to mess around with gyros we tried a 401 on my MB339 which is pretty stable. I found that it was easier to fly smoothly, however it did feel like in the turns the plane seemed to take a yaw track to the slight outside of the turn. It was almost like you had to use rudder to coordinate the turns. The rolls did track better with less effort also.

For less stable aircraft like my F-4D Skyray it made it much easier to fly by stopping the tendancy for the airplane to yaw tuck in the turns due to spiral instability.

For my JL F-4E Phantom I primarly use the gyros to smooth out flight, I find it easy to make my F-4 jink around the sky if your not super smooth, I get lazy and just slap the Gyros on : )