I got these for my son who needed shoes for the theatre. He wears a size 10.5 men's street shoe and we bought 13 which fit him well (maybe they're 1/2 size too big, but he's still growing). He likes them.
I tried this shoe on and was in love with how light it is! It was comfortable, light, but still had a good, shock-absorbing sole. However, my experience was it was lightweight because it's mostly made of stretchy fabric. As I danced, my foot moved against the fabric and didn't feel secure at all. Suddenly, shoes that felt just right before seemed a size or more too big. I could have bought the same shoe in a smaller size and tried it again, but then I think my foot would be hanging over the edges of the sole as the pair I bought fit perfectly (while standing still). I gave them to a friend who seems to like them, but there were just uncomfortable to me.