So far so good.  I've had them about a week and use them in the gym and when I'm doing Insanity.

I wear mine with socks and they seem to fit true to size.  They are comfortable, lightweight, and breathe well.

My only concern is that the toe may wear out faster since there isn't as much padding compared to other shoes.  I haven't noticed it yet, but it was something that crossed my mind.

I would definitely recommend them and, if they hold up well, would purchase another pair in the future.