I organized one of the Sprint Booster group purchases and can tell you that at least 80% of the people the participated love the device. To me, this is the best mod outside of the race level brake upgrade on my SRT6.

It basically fools the computer into using a different curve for the accelerator position. To me it gives a feel much like a cable setup.

If you have a manual, you can get one of two versions. The Sprint Booster for the manual gearbox is quite aggressive. The Sprint Booster for the automatic is still aggressive, but not excessively so. I've found it to be quite easy to relearn the throttle after installing it.

The engine is much more responsive. If I want to drive extra conservative, I just leave the Auto-Stick in 'W' or Winter mode.

Hope that helps.