I've been reading around the forums on hair straighteners and doing some really heavy research on some popular brand hair straighteners.
For the people with thick, straight, shoulder-length hair, this type of hair would easily be hurt during the straightening. They would become really frizzy and coarse. Then the hair is a little difficult to straighten, and always have to use high heat.
I've read the reviews on some cheapo hair straighteners (Conair, Remington, Hot Tools) and even some not-so-cheap ones (Chi, Corioliss, Wigo, HAI). The Chi worked OK for the hair, but it wasn't as amazing as people claimed it to be: it totally dried out the hair, and didn't even get or keep it that straight. The Conair ones worked better than that! Besides the point, it always broke within 7 months because of the cord (which I've heard is a very common issue).
I've also narrowed it down to either the Solia or Sedu hair straightener to purchase. They both seem to have their pros & cons, especially after I've read thousands of reviews on the web. The reason why I am not spring for the Sedu, despite the rave reviews, is concern about the heat - the hair is a tad difficult to straighten, and I'm afraid the Sedu might only work on thinner hair; not on thick hair.The reason why I am not go for the Solia is the plate system (Dynamic Alignment System). After reading SO many reviews, I found that some people have said the systems creates a big gap, the plates don't exactly meet, it's ineffective, and it snags your hair at the ends.
Read the reviews before you choose a hair straightener is a good habit. For this, you could knew the brand like the palm of your hand and kept your hair from the damage by using a improper hair straightener.