I got the next smaller size and they were too small.  The company sent me immediately a replacement pair (tremendous response time), and these are better but a bit too big.  So I use socks.  Use them for workouts daily.  Other than fit, they are great fins.

When I first got these fins, they were a bit stiff and snug.  I stuck with them and now I love them.  They have relaxed a little bit so they are secure on my feet but comfortable. My foot was the middle of the size range.  If your foot is at the high end of the size range, you might find them too tight.  But I'm so happy to have my own pair so I don't ever have to worry about not getting a pair in my size at the Y.

Wow, this fin is so responsive; more flexible than other fins I have used.  The shaping on the underneath side of the fin makes for a comfortable fit and makes it more responsive.  
I did have a difficult time getting the sizing correct, got it right on the second try (I wear a nine and a half in a woman's shoe, had to get the yellow fin).

the shoes size is not accurate.My son wears 9 1/2 and I bought him size 10 and it is small>

After consistently trying fins one size smaller than these and finding them too small, I thought these would fit, but they're too big.  On the plus side, if they fit correctly, they would be great fins; they seem to be well made.

Pro: Seems so far to be good quality.  Works very well for my purpose.

Con:  Fit is loose for my size 12 shoe fitting.  Used ankle socks to better fit and this worked very well.