Defo feel a small improvement, wouldn't say the car is completely transformed but feels more instant throttle response which just increases the engagement. Also feel it makes it easier to rev match on gear shifts but that could just be a placebo.
Totally screwed up the car. The slightest touch of the accelerator and the car would leap forward like a scalded cat. Engine kept stopping while driving (really annoying when the engine stops while overtaking in lane 3 of the motorway).
Worse. Resetting the coding didn't fix it. Had to have the remap redone.
If you have a remap check with your tuner before changing this as it may not be compatible.