The Sentinel MF debuted in Spring of 1998 as a limited edition specialty disc. But players started to fall in love with it, and some of the players we sponsor said they couldn't live without it. So in Spring of 2000 we decided to make it a permanent part of the line. The Sentinel MF is unique among midrange discs. Its rare combination of speed and fade make it perfect for four situations: low ceiling approaches, skip/fade approaches, upwind approaches, and 'reverse S' approaches. It might be a little too much for newer players to handle, but better players will always want to keep the Sentinel around.