The Sprint Booster is a throttle remap device. It steepens the gradient of pedal angle (x) vs torque response (y).
While it gives you better response, there are 2 sacrifices over stock:
1) Jerky acceleration - it becomes harder, and one needs to concentrate more, in order to accelerate the car. every degree of pedal you put gives more effect, so for smoothness you need to lessen the degree to half. Basically, HARDER to modulate. Doesn't matter if one drives like a kid/hooligan though.
2) Driveline shunt on deceleration - because the mapping changes, if you release the pedal, the throttle SUDDENLY cut off. Car drivelines were designed with default throttle mapping in mind, therefore, if you lift the pedal, the throttle still goes through relatively gradual throttle release, and driveline shunt doesn't happen. With a throttle remap, if you lift the pedal, the steep gradient causes much more sudden throttle release, causing the flywheel to lose driving force immediately and it will shunt the transmission, causing an audible jerk.
All these, if you have an auto car, the automatic transmission's torque converter buffers it a lot, but it still happens.
My car has a form of throttle remap which I don't use unless on track. Using it anywhere else gives me trouble and irritation. But it is manual car though. But I always think, if I want more throttle, I just step harder lah... on track got no time to step more, so hence throttle remap is good for me.