I train horses professionally and I run marathons as a hobby. My Doc recommended these to me to try for my sunken arches.
They do take time to adjusted to( they do come with special instructions you must follow) and cause minor discomfort at first( my feet were sore for a few days nothing I couldnt handle) but the results are fabulous! Completely elimanated my IT band issues and my shin splints. I bought them at Bed Bath and Beyond for the retail price so i have not had problems with ordering from the company.
I know several other stores carry them and are much cheaper than custom orthodics. Also many online stores with good reputations like Amazon.com carry them as well.