Any runners/athletes use the fivefinger running shoes. I just picked up a pair at REI, and while trying them on, they felt weird. A number of folks swear by them at my karate class and my current running shoe just isn't cutting it in the dojo. The grippy rubber sole of the running show is affecting my moves. Still, I'll need to get used to them, and my little toe just doesn't want to go into his little home. Its all curled up and usless so I don't think its a major issue. For those who do use them, how snug are yours? After getting my feet measured the ones that should have fit, felt a little too snug, lifting my toes produced a tightness. The next size up felt better with that, but there's a bit of play at the tip of the toe - is that ok?