They work as advertised.  I was concerned before I ordered them because the shoe trees are made to fit several shoe sizes, and in the pictures they do not appear to be adjustable.  When they arrived, I learned the secret - there is a fairly heavy duty spring inside the toe section that pushes back on the metal rod that connects to the heel piece, so the trees can work for several sizes.  They are well made and have that distinctive pleasant cedar smell.  I am slowly replacing old plastic shoe trees with these, and I bought just one pair to make sure they work before buying more.  They work, and I will be buying more.