I ordered 1/2 size bigger than my size(size 7.5 M); they kind of felt loose in the back.  I got them because of the color matched my dress that I was planning to wear at a wedding.  I needed a pair of shoes that looked nice and comfortable with heels. Actually, I was pleasantly surprised as to how comfortable they were especially since I am not used to wearing heels...  I got lots of compliments and I was able to dance in them for more than 3 hours without any blisters building up anywhere on my feet.  I watched other women take their shoes off by the first hour.  I'll keep them hoping to have another occasion to wear them again.  Do you want to buy a used pair? LOL!
I highly recommend them for the comfort in a beautiful pair of shoes with high heels!