I have extreme flat feet and use custom inserts in my shoes.  However most shoes are just to "squishy" and let the arch support roll over and you end up pronating even with the custom insert support.

I was having major pain in my feet that made walking extremely painful.  I've been in these for a few weeks and the pain is gone and the support is amazing!  I wish I had known about "motion control" shoes years ago.

UPDATE:  The material on the sides of the shoe are very thin.  I can tell you this because I now have a 2 inch split right below the "N" on the inside of the left shoe. Shoes still feel great but not pleased with the added ventalation I now have.