I'm going to have to chime in to this one.

Loose the gear drive.

I was stoked when my box from summit showed up, and beneather the cam, lifters, headbolts, blah blah was a box with a Summit Gear Drive in it. When I first started the car, I was absolutely stoked like the kid I am.
"Woo! Listen to that whine!". Little did I realize I was also hearing the idler popping around in the timing cover,
and couldn't listen for abnormailites in my engine any further.

2 weeks later I realized a few things:

1) My valve timing was now off, and I had lost a substantial amount of power
2) The geardrive was like stamping a gigantic "Poser" sticker on the side of my Nova. I don't know who I'm paraphrasing off these boards here, but a gear drive is pretending to have a supercharger, mostly found on a stock low-compression motor. You have a blower, don't need to pretend you have one as well
3) The noise freaking sucks. My car sounded like the USS Ronald Reagan. No matter where I went, I got exasperated looks from everyone, and laughs from the people will real superchargers. Dont waste your time if you're going for a cool factor.

All in all, fun for a day, but ass in the long run. Mechanically, and aesthetically.