Review (3/5): Great for curly hair, not as effective for straight hair
I was really looking forward to using these rods after hearing about them from a friend. But unfortunately, I have naturally thin and fairly straight hair, so no matter what I tried, I could never get the curls to hold definition of any significant kind for more than an hour or so. The rods can only twist so tightly by design, so there will always be a gap or "loose" feeling while you're wearing them. The best I could achieve was a very wavy look, and that involved coiling my hair while wet, using a root lift product, then blow drying my hair with the rods intact while leaning upside down. Then light hair spray, all before taking the curling rods out. Even then, the curls would be defined for a good hour or two, but then fade into a wave effect. However, if you have naturally curly hair as my friend does, these work great to give your normal curls a nice bump up in definition and hold. So basically, I found that the effectiveness depends on your type of natural hair and thickness.