It helps stretch the shoes so they fit my wide feet, and I like that I can put little bumps in different places, but they are both the same form meaning no differentiation between the right and left foot.  This means there is a hole to put a proper little bump in on one foot for my big toe, but not one for the other foot.  I wish the forms were mirror images of each other rather than the same form.

They work fine, but I cannot stretch the big toe area of one shoe.