Had one on a tail dragger that was squirrely on T.O. It was a great help. Yes, I've been flying for decades, way before computer radios. I just installed the HK 3 axis on a Yak 54 foamie. Haven't flown it yet, but I bet it will help with some manuevers. It can be shut off from the Tx.
Love to watch all the haters on here that haven't tried it, but are ready to condemn it, Whatever happened to "Don't knock it till ya tried it?"
One of the reasons I bought it is I like to tinker.
Just my $.02