I rotate between Dansko's, Merrils and those ugly crocs. I have a white pair of Dansko's from clinicals that I sometimes wear, but I perfer my black or Brown ones. It DID take a log time to break them in, but now they seem to be very good for my back. Unfortunatley the are so high that they make most of my scrub pants too short. When I want to wear my short scrubs, I wear my Merrils, which are nice, but rather boring looking.
Crocs? I swore I would never wear those stupid plastic shoes that are mostly worn by 6 year-old girls here in CA. But DANGed if they aren't the most comfortable shoes I own. Get them in black and they dont look as stupid. I do find that I trip a lot when I wear them,however!!