This is an expensive straightener, but it's worth every penny! I've had mine now for over a year, and I know I'll have it for many years to come. The iron itself is black and gold. I have long, thick, straight hair, but it gets a little wavy underneath if I let it air dry. If I blow dry it, it gets a little poofy and I use this to give it a more smooth, sleek look. It takes a couple passes of going over my hair before it's completely straight, but with cheaper ones it takes longer. It doesn't take too long to do all of my hair. It heats up super fast, and if I'm in a hurry and forget to turn it off, it turns off by itself after thirty minutes. I have dropped it a few times, and it's still going strong. I recommend this for everyone.
To achieve stunning curls: Mist hair with GHD Heat Protect Spray (sold separately). Section the hair and lightly mist with a Curl Hold Spray (sold separately) to add shine and hold when styling. Place a fine section of hair between the plates of your GHD Professional Styler vertically one inch away from the root. Gently close the styler with minimum tension. Turn the styler clockwise by 90 degrees. For an intense stunning curl, continue to turn the styler by another 90 degrees as you glide from root to end; pull the styler very slowly away from the head in a continuous smooth movement. For a softer curl, pull the styler quickly through the hair away from the head in one continuous smooth movement. An S-shaped vertical curl is created. To complete the style, repeat through all sections. Finally, separate and brush out the curls with your fingers for more extreme curls, or with a wide-tooth comb for soft, loose waves.
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. 
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.
I worked in the hair industry for a while so I've used a lot of high end flat irons and I got to say, this one did not impress me at all. I'd never used a GHD before this btw (none of the stylists I know have one) but I ended up ordering the GHD classic styler--which btw seems to be the same as the "IV styler"--instead of the CHI Turbo due to the fact that at the time, the GHD was on sale and basically the same price yet it offered more versatility (the turbo has a velvet cover so you can't use it to curl).
Dual-Zone Technology: You will have heard of Tri-Zone Technology if you own a ghd Platinum Styler, so think of Dual-Zone Technology as its little sister. Instead of three heated regions, this styler features two, one towards the tip of the styler and another closer to the base. This essentially means the straightener has better control over the way it heats your hair, instead of over-delivering in one area and lacking in another. Think quicker styling and a more uniform look in terms of sleekness and smoothness.

New without original packaging. Glimmering gold accents and plates and an enhanced design give the ghd gold V classic styler a luxe feel. Smoother gold plates glide effortlessly through the hair to make straightening on all hair types and lengths even quicker and easier, while their contoured edges help to create perfect curls and waves, all with a high shine, salon-style finish. A handy protective plate guard also allows you to pack up your styler straight after use while an automatic sleep mode is activated if the styler isn't used for 30 minutes.  Universal voltage ensures you'll get the same styling performance wherever you are in the world, making this styler a great choice if you travel frequently.
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.
We’ll admit, the $150 price tag did give us pause, but when it comes to applying high heat to our hair, we want to make sure the styling process is as quick and snag-free as possible. While a lower quality tool may save your budget in the short term, if its mechanics aren’t up to par it could require a few extra passes over your hair, which can wind up damaging your strands in the long run. With the GHD Classic Styler all you need is a quick glide in order to achieve perfectly smooth hair. The thin, rounded barrel even makes it ideal for mastering those loose waves you’ve been dreaming of.
Against the ghd Platinum Styler: On the other hand, the Platinum Styler features more sensors and heaters than the new ghd Gold. This essentially means it will heat the hair quicker, and is a little safer in terms of heat delivery, too. Six sensors and heaters work to deliver optimal heat to the hair, instinctively adjusting to give you a transformative experience. Where this is the top-of-the-range choice, the ghd Gold Professional Styler sits perfectly in the middle, a great mix of affordability and professional quality.
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