Review (5/5): Perfect for wigs.
These are perfect for styling synthetic wigs.
Other reviews have complained about them not having brushes, these are meant to be secured with roller pins, it's an old fashioned way of doing it, but it doesn't leave a mark from a clip or pull at the hair like the ones with brushes. It can be tricky to get the hang of, so they're best for use by stylists rather than on yourself, but the airflow they allow makes hair dry faster.
I also saw a review saying they warp with heat. I've used a fabric steamer on them at least 5 times and they haven't warped at all.