Opcon and sprintex are 2 seperate companies. Sprintex is licenced by AEC in QLD, and these are the superchargers used by AEC on their bullet supercars. ( if you can call a hairdressers mx5 a supercar.) OPCON make the autorotor, and is a dutch company. From my research, they are the best of the twin screw blowers on the market at the moment. PSI blowers are too expensive, and are only available in 4L or bigger. No good for street cars. Whipple chargers are o.k., but cost twice as much, and have no development on them for about 5 years. Sprintex blowers are not curently manufactured, at least they wernt in november last year, as AEC were trying to redevelop the blower, and manufacture them in OZ to give very competive pricing. Early imported version of the sprintex had a weak rotor casing, and were prone to rotors touching each other over 6500 RPM. Not good if you want to rev. OPCON have a very well priced and functional unit. They can be bought from a company in Victoria called High Perfocmance Products. http://www.hi-flow.com/
The guy that runs it, Hans is very good, and knows what he is on about.
Well thats my 2c worth.