The bottle doesn't get full and stay full, it flows back out to the engine. All it does is give contant fuel flow, especially with the on-road cars that are always screaming to the next corner and slowing down to take the turn. The constant on and off throttle movement causes an imbalance in fuel flow... so they say.
I don't run a boost bottle and don't really plan to install it in one of my italian based engines. Not worth "trying" on an engine that's close to, or above $300. It's also another source for an air leak. OS, I think, had it for a while but didn't seem to click. If anything, proper tuning should relieve many throttle issues.