I wear f-lites to work... blue ones for normal workdays and when I have to dress up smart in a suit for art fairs and the like, I wear the all black f-lite pk's... Hardly anyone notices you are wearing what practically are trainers... and those who did notice thought it was pretty cool!
I have the theory that not many people look at my footwear, but they would notice it if I were grumpy because of sore feet and legs :D
Oh and most of the time I wear them 'slipper' style, with the heel flattened down, so I can easily slip in and out of them... :)