Here's a case where REI's liberal return policy came in handy.

When I first bought shoes for going clipless last October, they felt fine. As I ramped up my riding this year, a bunion condition I already had in my right foot worsened. The shoes felt fine for my first metric and even my first century. Then things started getting worse. My foot was super painful after a 125 mile ride at the end of June. So that's six months and probably 700-800 miles in the cycling shoes because I still wear sneakers for most non-road bike rides. REI gave me a full refund on the original shoes. I switched to a Shimano shoe that was wider (and more expensive, naturally). I only had to pay the difference. The new shoes are better but still not perfect. Wearing a thinner cycling sock instead of a regular sweat sock also seemed to help.