School me on supercharging a 360

I have been looking at a few manufacturers of roots type blowers websites. Weiand, Dyers and BDS off the top of my head. The Weiand's seem to be cheaper, but I have been told they are not as good either. The Dyers look like a decent piece and the BDS blowers look like they are very good, but a little pricey. What are your opinions on the different makes?

Jack