Besides running and everyday wear, I got my Vibrams to play Ultimate Frisbee. Some friends and I developed a list of people and almost every day during the summer we'd get together in the afternoon, call everyone we could think of, and play 3 or 4 games of Ultimate Frisbee. No shirts, no shoes. Just shorts and a Frisbee. And We played the game, and We saw that it was good.
That said, I've only tried my Vibrams to play once, and I just couldn't do it. 10 minutes in, I shucked 'em for bare feet. I felt like I lost agility and communication with the ground. Has anybody else had any success in a sport like football or Ultimate with these on? I'm not particularly worried about it, just curious to hear others' results.