I am condidering buying the fireball, but I want to know something about it first.
It is!
It’s a looper, of course it’s responsive. 
All yoyos that are supposed to be responsive.
The fireball uses a plastic transaxle system. It’s basically:
The transaxle is a plastic sleeve that goes over the metal axle. The string goes around the transaxle. The idea is like a ball bearing: reducing wear and friction.