I was used to prepare a dossier seen an appointment and I really found it more enjoyable than a shirt cardboard or plastic. You can put a lot of leaves.
So, I decided to buy for me this time. They serve me to tidy my papers by subject before putting them in my carrying case.
It may seem useless but by doing this we gain more space between EVERY hanging files directly if we put the papers (I tested before ordering others the pockets "tamp" the leaves.)
In short, it's a bit expensive but well worth it.
And for reviews that said pockets and wrinkle deteriorate. I think it is simply because they are made for papers, documents etc. and not for objects.