The Challenger™ is an amazing overstable putter, and very popular with advanced players. It can get around trouble for those long hyzer putts and is overstable enough to take a good amount of snap on approaches.
I use this disc as my main putter, and for a lot of short midrange shots. Very useful disc at slow speeds and you can even use it off the tee on those shorter hole.
-Nathan Doss, 2005 and 2007 World Champion
"The ultimate putt and approach disc. It's an overstable putter that has a great grip and is incredibly consistent. I enjoy using putters for drives and midrange shots when possible because they land softly and don't skip far from the target."
-Adam Goodman
"I use the Challenger as both a midrange and as a putter. Thrown flat and hard it will hold a perfectly straight line. I prefer the Pro-D plastic in this model because of the superior grip that it provides. On windy days the Challenger takes over as my starting putter."
-Jim Davidson