I ordered size 7 which I usually am, but my toes were too close to the edge and running in them would had turn into painful experience. I've never bought Mizuno, but they got  great ratings and recommendations. I did return them and went half size up. Only problem I had with the componay is that they didn't exchange them for some reason so I had to reorder the bigger size.
Now I just have to wait for my refund ! I will update when I'll receive it ! 10/06/2012