Hot Rollers

I have numerous styling tools - my DH would say too much (2 straighteners, multiple curling irons, curling wand, 2 wavers, hot rollers, etc).

I am currently on the hunt for new hot rollers. I currently have this (more big curls) Conair model:



The Conair model gives my hair volume for less than an hour, which is frustrating because my hair holds curl very well. I typically use no product in my hair and the curl will last until the next day.

So - does anyone have any recommendations for hot rollers that actually work?

Thanks!