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.
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.
Like all ghds, the IV heats to 185 degrees, which is perfect for creating a poker straight finish, glamorous curls or beachy waves. The floating aluminium plates make the styler easier to hold and control, while also ensuring those tell-tale dents in the hair are a thing of the past. Other features of the IV Styler include a 2.7 metre cable, an automatic shut down after 30 minutes, and universal voltage. 

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This iron claims to heat up in 15 seconds; it also claims to use some bullshit technology that allows it to "self adjust" temperature according to hair type. Well it got warm but it sure as hell didn't heat up enough to seriously straighten or curl my hair in a mere 15 seconds--in fact, I found that it didn't ever straighten my hair enough to satisfy me.
Featuring advanced ceramic heat technology, the ghd Gold Professional Performance 2" Styler is designed to operate at the optimum 365°F styling temperature for healthy-looking hair with enhanced, lustrous shine. Styling thicker, longer hair is quicker and easier thanks to the larger plates that glide through strands without snagging for fast, effortless styling and flawlessly polished strands. It heats up in as little as 30 seconds to tame frizz and transform coarse textures into sleek, smooth styles that last. The styler has contoured, round edges to unleash undulating waves, and with its styling versatility, you can change your look every day.
As far as we’re concerned, this is the best hair straightener we’ve tried. Not only does it heat up in record time (only 30 seconds until it hits 365°F), it’s also been lauded for its frizz fighting capabilities—as mentioned above, a must down South. What’s more, it lasts. One editor’s trusty Classic Styler is still going strong after 4 years of almost daily use.  
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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