(I usually wear 9W/9.5/9.5W.) Initially, they were snug enough I couldn't wear socks, so I stretched them using a shoe-stretcher and stretching spray, now they are a much better fit. They are comfy and great overall flat.
The only downside is that the heel blisters are probably the worst I've ever gotten. I went for a walk with a friend thinking, "I've been wearing them at work for a few months, and their so comfy, so it's probably fine." I now have open-wound joker smiles across the backs of my ankles (and the inner leather is soaked). The heel leather just isn't softening much, even after like a 100+ hours of wear at work, shopping, around the house, etc.
To be fair, I've purchased 3 pairs of American Duchess Shoes, and the leather is super hard on all of them. I've had no problems with the Claire shoes, since they lace-up and hug the foot. The Hazel shoes have the same problem as the Bertie shoes. (But I apparently forgot how to walk in heels during the pandemic, so I rarely wear them.)
I'm waiting on purchased products to cushion the heels, so IDK if that will be helpful or not.