Do Adidas Samba run small, big, or true to size?

I just ordered some adidas sambas online and hoping i didn't get the wrong size. i usually wear a 6 and 6.5 in shoes. so i ordered a 6.5. i have read so many things saying they run small and they run big. and i know it might just depend upon the person and their foot. can anyone who actually had or have these shoes maybe tell me the answer??