My 2001 BMW E46 has a Vortech V2 centrifugal supercharger on it. As some have mentioned it doesn't have that "instant power everywhere" feel typical of superchargers. It takes some RPM to build boost and until it makes boost you would never know it is there. Once it comes in the power curve is very similar to that of a turbo but with a different sound. I like it and I would do it again.
IMG_0100 by
willtel, on Flickr
E46 Vortech V2 Supercharger by
willtel, on Flickr