The Millennium Standard Omega utilizes a KC Pro type plastic to provide a more firm feature that some players prefer for their putters. It uses the same mold as the Omega AP but with a stiffer plastic. The stiff plastic gives you more control of angle and direction than the softer plastics and is very stable for windy conditions.
It is an excellent disc for players who like a stiff hard plastic for driving. Compared to DT it is more durable and retains its flight characteristics longer.