As others have said, they are comfortable from the start.
But again, as others have said, get the next size down from your regular size. I am a UK size 7, and quite often have to get a 7.5 as I seem to be one the edge of 7 and 7.5, but even I had to send back the 7's and request a 6, which fit perfectly.
Since I have been wearing them around, I have been approached by people who have admired them and asked what they are. Two have gone on to purchase their own, and been very happy with them. They are perfect for running errands, and also for going to gym classes like Pilates and yoga. It is still too cold here to wear them out for the day, but I will definitely be wearing them all day during the summer, as they are quite stylish for casual outfits.