I use the red and white Denman. I tried Reniece's method too. It's really better than my previous results, but I'm hoping to improve because I have to take minuscule sections to do it right now.
I have also tried the Denman for straightening that has two plates of boar bristles that overlap and clamp down on your hair. I got about 4 inches worth of breakage as a result and chucked it right after.