Bought another SE5a recently, they were half price and I couldn't resist..

Flies great with a 40% Aileron / rudder mix (on a switch to disable it if necessary)

Agree with the previous comments that you don't want it on aerobatic machines but for a slow flying scale aircraft with lots of adverse yaw it works well.

https://www.youtube.com/watch?v=swJO1aYo_YA