It definitely works. You just have to be careful of having flat sections on the back of your head. Make sure you either have a bun there to add volume, or a clip to cover the flat spots with curls. How To: Make Natural looking Beach Curls
My hair now does this without the flatiron! - Waves in 15 minutes! Section hair into big sections then braid each in a loose braid. Run a flatiron over each braid, let them cool down, spray hairspray and undo the braids.