I am on my feet all day for my job and have tried many brands of shoes and boots that would stand up to this daily task.  This pair of Dr. Martens is by far the most comfortable pair of shoes I've used for a 10 hr day.
I wear 9.5 US and by recommendation got a 9 originally that was too tight so exchanged it for a 10 and with and additional
thin insole put in, it fits like a glove.  Break in took less then the 10 hrs I in it for.  Overall, the product stands true to it's brand reputation and I definitely will get another pair.  Amazon had the lowest prices around and delivery was 2 days as a Prime member.  NOTE: the exchange was just as fast!!