I bought my regular size shoe and it fit, i.e., these seem to be true to size.  My biggest problem is that the part of the shoe above the heel is a bit too tall for me (I don't usually have this problem) and stiff so it bit into the back of my ankle.  I crushed the back part of the shoe a bit with my hands and wearing the shoe has made it more tolerable.  If I had tried the shoe on before buying, I would have left them at the store due to the problem with the heel.

The shoe is otherwise comfortable and surprisingly cushy on the bottom.  I use them as walking shoes when running errands on weekends.  I wouldn't really consider them a "trainer" or shoe for sport, except for Tai Chi or yoga.