TEENS: What hair straightener do you use?

My sister has a chi and it is really good if you don't have extremely thick hair. I just have a cheap walmart brand, but for thick hair like mine it works REALLY good, I straighten my hair when I get out of the shower at night, and then just touch it up in the morning. I dont have to fully straighten it in the morning, It takes like 10-15 min at night then like 2-5 in the morning