I have hair that can look about like Kramer's from the old Seinfeld show. It's like it will slither right up into the sky searching for moisture on its own, and I feel like a big dandelion puff. I have fought with my hair for years and years, thrown brushes at the mirror, cried, you name it. Plus, I live in the south, where humidity is a given.
A few years ago, I went to a new hairstylist, and he used a flat iron on me. I thought "whatever" as I had had flat irons in the past that never did much once I was in the elements. Well, the day wore on, and my hair stayed straight. It even rained (which normally would have me looking like Bozo the clown's sister) and my hair stayed straight. I RAN to that hairstylist, begging him to find me my own flat iron like he used. $90 lighter, I was the proud owner of my own CHI iron. I haven't had a bad hair day since. It's got some sort of voodoo magic in it that I cannot explain. It's NOT like a flat iron you'd buy at
Walmart or Target, it's ...well, magic. I've tested my voodoo magic flat iron in WDW and was thrilled to find my hair looked great.
Obviously I can't say enough good things about the CHI iron. I can flick it around to make waves if I don't want to be totally straight, too.
ETA: my hair is baby fine and insanely curly/frizzy normally, a few inches past my shoulders.