I have heavy, thick hair to my waist. It's not easy to curl so once I find a tool that curls it without too much hassle, I'm all over it. I must pimp the Conair spiral curling iron.
I'm very anal in regard to styling tools I recommend and this one meets my standards. My hair usually doesn't respond to hot rollers or regular curling irons. This has given me beautiful spiral corkscrews that garner many compliments. I bought mine at Ulta and it is the one with the pink shaft and white controller and costs $14. (Sorry that I couldn't find a picture of the exact one I bought.)