I am a security guard at a major museum and work two twelve hour days a week.  Dansko gets me through.  This is my first pair of Pro XPs but after just putting them on for size, I can tell they will be very, very comfortable.  There is a reason doctors and nurses swear by these.  My sister and sister-in-law are both nurses and recommended this shoe to me. Another thing I have noted with Dansko's...becuase of the slight heel I am compelled to stand up straight which, actually, accounts for less physical fatigue on my part.