I have tried the "Immunity" of a 2,4ghz link myself, and I am convinced!
Ok, not with planes, but with my FG Leopard Race.
A friend has another FG, with an ordinary Hitec Agressor FM set.
At some point We were driving at the road where We lives, and We see an old and badly maintained car comming our way.
When that car was around 100-150 yards away, my friends FM set went CRAZY, absolutely NO control, Jitter and more. Luckily He had time to catch the car and hit the Engine Kill, before the car ran away.
On the other hand with My car, I had full control, even with that RF Noise generator(Car) parked 2 yards away.
When the car was turned of, my friends servos stopped jittering.
And this is not something I have read somewhere, this is my personal experience.
I am running with a Nomadio Sensor 2.4ghz system.
I am also looking forward to the Nomadio Sports Flyer Radio, that according to rumour might be available this summer.(Some even say late spring)
The Nomadio Sensor btw. uses a 100hz frame rate, and can be set to use 50hz on the channels where you want to use Analog servos.