They are undersized. I usually wear a size 10.5 but ended up buying a size 12. I would probably be more comfortable wearing a size 12.5. I ordered my true size first. Too small.
Pros
Comfortable, true to size and easy to wear with many outfits.
Cons
I ordered 2 pairs for 2 daughters, they got the sizes wrong. Unisex for both, one was women's size, the other was men's size.