I took the advice from other reviews and ordered a half-size down (I am usually a 7 or 7.5, and I ordered a 7)...realllllly uncomfortable.  The front part cuts into the top of my foot in the front, and the heel is ghastly.  I tried to wear them in so now they're at least bearable (no blisters now)...but it's no picnic, and I still have marks on my feet after I take them off.  Steve Madden and/or Ralph Lauren flats are MUCH more comfortable.