Review (3/5): These work well - but they are not comfortable to sleep in.
Unlike some others, I had no difficulty using the product. I have hair below my waist and I found there was no difficulty at all utilizing the tool or the curler. They made a nice soft curl that held throughout the day. From those considerations, this product worked well. If you have a lot of hair, they can be quite heavy.
Unfortunately, these are not the most comfortable things to sleep in. I wrapped them tightly on my head and still felt like I was sleeping on a lump. If you have time to utilize these while NOT sleeping, they will work fine.