I don't know if "too small" is the correct reason for returning these because I never got my foot inside to find out.  Even with the zipper all the way down, there simply wasn't enough room for my foot to pass through the allowed opening to get INTO the boot, but perhaps THAT is an indicator that if my foot had managed to wriggle past the opening the boot would have been too small.
As for how they look and build quality - I like them very much.  I'm almost tempted to order another size larger just to try them again.