What do you mean by dual v? the powernozzle seems like it would not fare well on thicker carpeting. I have heard that the one used on their platinum and windtunnel cyclonic is a great nozzle though.
It has dual suction inlets. One on each side of the nozzle, and I have a very deep pile carpet and it works wonders on it. It is probably one of the best nozzles I have ever used, and the Windtunnel canister power nozzle is probably one of the best on the market. I love mine.