Those training sticks were designed back in the days of flybarred helicopters, when all we had were tail gyros. So the vibrations that the sticks cause, had little to no effect on the gyro or the way the helicopter performed. Our newer FBL gyros are very sensitive to vibrations, and the sticks can cause them to get a little weird. In my opinion, they are more a hindrance than a help. The reason I say that is... 1. They can make the gyro act up...not always, but they can. 2. Most people who use the sticks, end up hovering 3-4 feet off the ground, which completely negates the effectiveness of the sticks. But by staying low enough to allow the sticks to do what they are made to do, you have to stay in ground effect. Which contributes to the sticks making the gyro act up.