I do believe it (the Sprint Booster) does what it says and will make the Crossfire (actually any vehicle you compress 60% of throttle travel into 25% of pedal movement) seem a lot more peppy and responsive.

But if it doesn't "really" add to my cars performance, then I feel it's just a gimmick that I don't need. But I guess it is a easy way to get a little more fun out of your car without having to wrench.

Much rather spend my $$$ on an ODPS, upgrade the intercooler capacity, custom billet grill, do some painting etc...