I already owned this style in brown and found them to be super comfortable as well as super cute with skinny pants for fall and winter so when it came time for a new pair of black boots I didn't hesitate.  The top buckle is adjustable which is nice when I wear thick socks in cold weather or would also work to loosen a little around the calf.  The zipper goes all the way down so they are super easy on and off.  As with my brown pair, I get compliments on these everywhere I go.  The only downfall to me is that I can't wear them all year long!