As mentioned earlier, the GHD classic Styler uses ceramic plates which heat up faster than other materials but it doesn’t emit negative ions like tourmaline flat irons, which doesn’t only straighten hairs smoothly but also makes dry and damaged hairs healthy by counteracting with positive ions. So, in terms of professional use and/or greatest results, GHD classic styler can’t be recommended. That is my personal opinion as an author. As an alternative, I can recommend you to read CHI Air hair iron review, it is tourmaline ceramic, and thus little more in price in comparison to classic styler.
I love my ghd hair straightener and use it several times per week. It heats up quite quickly (in the region of 20-30 seconds) and heats to the perfect temperature for my hair. It's nice and light and feels comfortable to use. I find it less damaging to my hair than other cheaper straighteners, but find that it's definitely worth investing in some argan oil or other heat-protective product. Ghd straighteners are on the expensive end, but I think it's worth spending the extra money to buy a product that does a good job.
To have straight hair, you just mist your hair with the GHD thermal protector. You then start at the part of the hair that’s closest to the roots, and then you glide the GHD Classic 1-inch Styler to the tips in one smooth stroke. You can also follow the easy directions for soft movement and for curls, which involve some turning while you glide from root to end. 

Inferior hair straighteners take a very long time to heat, and you really need to make sure that they’re on their highest setting to have any effect. But that means getting lots of split ends, and you hair often looks frizzy, dry, and generally unhealthy. And once you go outside, if ever you live in an area that’s a bit humid the straight hair quickly goes to its default pouf settings. 
Against the ghd IV Styler: Although the IV Styler is one of the original products in the ghd range, it’s still pretty beloved amongst customers, especially because of its affordable price. Unlike the new ghd Gold Professional Styler, though, this product only boasts one sensor that stretches across both plates, meaning it’s less intuitive at heating your hair.

GHD Classic Styler, from the name itself, you can deduce that this simple yet versatile device was made to style and straighten. Armed with a rounded barrel and advanced ceramic heaters, you can curl, flip, tease, wave, and straighten any hair type and texture easily without damaging your hair’s external surface. The infra-red heat technology infused within the plates also releases more negative ions than other products so your hair’s natural oils and luster are retained despite repeated exposure to maximum heat. 
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