Kraftwerks is a new company that has been focusing on the development of Rotrex superchargers, which replace the drive gears found in a traditional centrifugal supercharger layout with what is called a "friction drive system". This reduces heat and results in quieter operation. The Rotrex compressor is capable of revving extremely high and producing a linear powerband with instantaneous response. For those interested in proven technology with lots of potential, the Rotrex supercharger from Kraftwerks looks very promising!
Based out of Norco, California, Kraftwerk's superchargers are claimed to outperform any turbo or supercharger alternative on the market.