Yeah, my job pretty much requires spending considerable amounts of time and money selecting footwear.
I wouldn't want to be walking for 12 hours a day in crappy shoes.
Ideally, my Rockport sandals are the most comfortable footwear, but they are unusable at work, and unusable in the winter.
I don't have any problems with my heels, but I do get callouses on the sides of my big toes. I used to get blisters there all the time, like a few hours of hiking would do it, no matter what shoes I used. Now I'm walking a lot more, but the Rockports are very comfortable, so they're not like big or painful, it's just that the skin on the sides of my big toes is -very- thick.
I've been trying to find the same style around, just because mine are incrediably worn on the soles. Like, there was more tread on my old tires (the 15mph spin out ones) than there is on my shoes. I need to be careful on slippery floors because the soles are completely smooth, no tread at all.