They are pretty cute, but I'd really be wary of comfort...the uppers look syntehtic and if that's the case, they won't stretch. I have shoes with those kinds of straps and even when they're real leather, I find them a bit binding/restricting.
I really like the way they look, but I would be hesitant to buy that style without trying it on first. I have a pair similiar to those and the straps really dig and leave marks.