Wow, my 8 yr old wears his everywhere he can. They are just a little big on him yet though, but he doesn't care. They are camo colored, his fav. He's never had a problem running in them or riding his bike. I've never once seen him even so much as stumble while walking in them, but yet he does sometimes with sandals and new sneakers.
I have 1 white pair so far from Avon, my feet never sweat like they do with socks and sneakers and I have no fungus problems lol. I was getting planter fasciitis often from going barefoot and just wearing flat flip flops, now that I wear the 'croc knockoffs' my feet rarely hurt. I also have a torn meniscus in my right knee that makes me a little unsteady when its really hurting. I never have any problems with my 'crocs' falling off, or making walking harder.
I would definitely say try a pair of real crocs or some from Avon for a week. You might just find you love them, like I do now (and I am still shocked I do)!