I have been sporting APR since couple of days and extremely happy with it. Keep in mind the first couple of hundred miles, you have to drive it aggresively, your ECU is going to adapt to your driving habits. If you drive it slow, your throttle responses are going to be slower. Wildhare had a good point, after quite sometime you get used to the power, and you will not have that OMG feeling, that is how tuners hook us up, and then we ask for more:biggrin:
Right now, i am driving it like i stole it. The same thing has happened when i had my Mini Cooper S, the same mods as my friends car, mine felt more responsive and quicker. APR is definetely quality, and like the previous poster said, GIAC is more tear it off style. Different folks, different strokes.