I've liked the Challenger since day one. It was the obvious choice for me when I joined Team Discraft. I was previously throwing a wizard and I felt the Challenger was a close match. With the release of the 2009 Ace Race disc, the Focus, it seams the Challenger has a friendly rival. I would have guessed that more people would have named the Focus as their favorite, I suppose maybe since its only been out less than a year. It's certainly popular with a lot of the pros.
I'm guessing it's a bit skewed by the fact that there are a TON of Michigan folk on here... discraft country, hence Challengers. I'm guessing in a true sampling worldwide, Aviars of various molds would blow every other putter away. But I'm enjoying the confirmation of my favorite disc at the moment. Challengers rule!