First of all, I normally wear a size 11 (occasionally 10.5) shoe and I considered ordering a size 10 because some reviewers stated that this runs large.  However, I ended up ordering my normal size (11) and the fit was fine.

Unfortunately, there was a bigger problem.  The shoes have a stiff part which rubs my heel in a painful way.  This is the same problem that J. Teegarden and AC describe in their reviews here.  My feet may be particular sensitive since I've had this issue with other shoes (usually very dressy ones and never athletic wear).  For this reason, I returned the shoes and I'm only giving 3 stars.

I was also a bit disappointed that this shoe has no fastening mechanism such as laces.  Those would make it easier to put on, and fit more securely.