I just received them in the mail yesterday so I can't say anything about long term or even running in them yet.  But, I was worried about the fit after I purchased them on Amazon.  A lot of people said Mizunos run small and I was worried.  In my case they fit perfectly!  They have a great deal of support and I think they will be perfect for my over pronation feet!  I will write an update after I have run in them a week or two.