If you're planning on buying this shoe, definitely go a half a size up. I'm a true size 6, and my toes touch the front of the shoe especially while walking. I would have loved to exchange it for he 6.5, but I had already used it outside :(

Other than the size, it's lightweight, and works different muscle groups than traditional running shoes do. I don't use it every time I run 'cause I pronate and I find that running too often in these shoes makes my ankles hurt. Never had issues with my Brooks runner, which offers a lot of ankle support for those who pronate.

Update:
I've been using these running shoes for a few months now and it doesn't bother my ankles anymore. I think it works on different muscle groups so there is an initial breaking-in phase, but now I love them but still find them a tad too small.