I used to use them when my hair was longer. I liked them for night, put them in while you do your MU, saved alot of time over using an iron.
I think mine is a Conair, it's got purple rollers with gray velvet. It only holds 5 or 6 rollers at a time, so I had to buy an extra set. Rolled the top first, let the 2nd set heat, then roll the underneath.
My Mom had a really nice set years ago but I don't think they make them with that many rollers anymore.