I'm a US Army medic currently deployed to Afghanistan.  I just got these the other day, and I can't tell you how awesome they are.  They're strengthinging new muscles, and durable enough to endure PT out here amongst gravel, rocks, and all kinds of terrain.  I have flat feet, and these keep the pain away better than any shoe I've owned before aside from my boots.  They're the lightest weight shoes I've ever worn to date, and breath really well which is a huge plus as it's already getting warm to say the least.  I would reccomend these shoes to anyone.  So long as they understand that it's not like regular shoes, and it will be awkward at first but is certainly worth it.  They have this soldier's seal of approval.