I personally have never worn them as most of the people in my area that wear them are women and the more femine men...it's created sort of a sterotype...and they don't look like tough guy footwear.
I myself will buy and wear a pair, for the simple fact they are anti-septic and antibacterial. This is not mentioned but is the reason they are used in alot of hospitals now (the closed toe / enclosed foot type, not with holes). They are supposedly really comfortable too, and I could imagine wearing them after a rough march.