Buy them if they have your size.  When the Sam Edelman (multi-button) OTK was no longer available I gave in to purchase this one.  It runs true to size.  I am a 9W with athletic calves (I'm a runner).  If you are  a big girl these will fit your foot and calves (buckles are adjustable).  The boot looks very shapely and conforms nicely to the curve of your leg; not bunchy/scrunchy/boxy or block-ish.  They will not fall down! Nice comfortable, spacious toe box.  A delight to wear.  You'll get lots of attention and compliments.  Promise.