The current temperature is shown on the LCD screen, and the screen changes the color depending on how high the temperature is. According to the instructions, the blue one is for fine or fragile hair (0-370°F), the green one is for medium or wavy hair (375-395°F), and the red one is for coarse, resistant hair (400-425°F). The mode button also helps you to choose the right heat level for your hair type.

this is the best iron money can buy. It is expensive but its worth it if you can save and buy it.
I ordered the ghd iv styler and was abit confused as to which one to order. I am happy with what I chose. It's small light and does the job wonderfully.
these ghd's come in a nice gift box that looks great. The set also includes a paddle brush and two hair styling clips. Also included is a case with combined heat mat. They heat up quickly and make short work of straightening my fine long hair. The paddles are quite small and narrow in comparison to other straighteners so may take longer to use through thick or curly hair. I was pleased with the results and the smoothness lasted for several hours. The only issue I have is that the straighteners only just about fit in the case and I couldn't also squeeze in the brush and clips so not as compact for travelling.
For hot air brushes, the same advice goes: always use a heat protectant, select the right temperature for your hair type, pay attention to the speed, intensity, and the barrel size of the curling brush. Ceramic and tourmaline coatings are considered to be the best ones for a hot air brush barrel. The only problem that may occur is that your locks may get stuck in the brush bristles. To avoid this, choose from models with tangle-free anti-static bristles, like this one.
An upgrade from their since discontinued Eclipse Styler, you won't be tempted to heat this flatiron up to 450 degrees, because the temperature dial is always stuck on one number: 365 (the ideal heat to mold hair without frying it, according to the scientists at GHD). Underneath each of those 365-degree plates are three fancy sensors that measure the density of the hair in the iron so that it can maintain consistent heat regardless of the chunk of hair you grab. The result? Silky, shiny hair with zero frizz.
My hair is naturally wavy so most of the time I let it air dry and I walk around looking like I am wearing a nest on my head. Straightening my hair goes a long way in avoiding that look. The straightener that I usually use is manufactured by a popular company starts with an r and cost a mere 22. I think that the differences between this more expensive brand and the one I usually use are insignificant. This styler heats quickly. So does the cheaper model. This styler straightens hair adequately. So does the cheaper model. The only differences are that the ghd classic 1 inch styler has a longer cord with a built in gfci device and remote test reset unit and is about an inch and a half longer which puts your hand further from the heat. In summary this model and brand of hair straightener heats up and straightens no better than a much cheaper model but does seem safer from an electrical heat standpoint. Except maybe for professionals I'm not sure that the significant cost difference over 100 is worth the additional safety features.
Wax on, wax off; we bet that’s the most in-depth thinking you’ve given to wax. Not only is it unclear how or what the stuff is, most companies slap labeling on products even when they’re not technically a wax! Here’s the deal, wax products feel just like the name says; waxy. They will feel spongy and have a thicker grip when you work it between your hands and leaves hair with a natural matte finish that can have a bit of shine. If you’re into edgy hairstyles with exaggerated lines and textured, piecey strands, then wax is ideal. The light shine also makes it perfect for formal styles like pompadours.  
The Apalus is another flat heated hair brush, primarily for use on dry hair. It applies constant heat when you turn it on, although it takes longer to warm up than models which use metal ceramic heating technology (this one simply uses ceramic plates). It can reach 180°F in 60 seconds, but will take three minutes to hit its top temperature of 450°. That can make this unit frustrating to use if you have to straighten thick hair.
The Glamfields straightener, like most of our top-ranked models, releases negative ions to fight frizz while preventing split ends and knotting. Performance, though, sets it apart from the pack. Hair is straightened beautifully and quickly with the unit’s metal ceramic heater requiring just a 40-second warm-up, eliminating a long wait for the brush to reach temperature. And speaking of temperature, there are 12 heat settings ranging from 250° (ideal for brittle hair) to 450° (hot enough to straighten extremely thick or wavy hair).
this product got to me in time I liked it a lot and so far is my favorite straightener
T3’s white and rose gold flat iron seems too pretty to reliably function, but hey, sometimes miracles happen. There are four temperature settings ranging from 260 to 410 degrees, and the tool heats up in about a minute. Its ceramic plates are infused with tourmaline, a mineral said to make hair extra smooth because it emits negatively-charged ions. There’s no scientific evidence to support this, but my unscientific bathroom study found that this flat iron does indeed make my hair look shinier.
If you are looking for faster results, a hair straightening brush is more appropriate – it is a hybrid between a brush and a straightening iron, used best on dried hair and effective even for the most unruly naturally curly hair. You can use the straightening brush on hair that is washed and dried, and obtain the straightening iron results with  much easier and intuitive brushing move.
When you’re shopping for a hair straightener it’s important to consider your hair type and the style you want for your hair. Some heat tools are designed to straighten and smooth your hair to prevent frizz while others may just be useful for basic straightening on hair that’s already fairly straight or simply wavy. Different temperature settings work better for different hair styles. Some straighteners are also great to create loose waves in your hair making them ideal for those who like to experiment with different hair styles. It can be helpful to read online consumer reviews when you’re choosing a hair straightener to ensure you get the best option for the money you want to spend.
Historically, working-class people's haircuts have tended to be practical and simple. Working-class men have often shaved their heads or worn their hair close-cropped, and working-class women have typically pulled their hair up and off their faces in simple styles. However, today, working-class people often have more elaborate and fashion-conscious hairstyles than other social classes. Many working-class Mexican men in American cities wear their hair in styles like the Mongolian (shaved except for a tuft of hair at the nape of the neck) or the rat tail (crewcut on top, tuft at the nape), and African-Americans often wear their hair in complex patterns of box braids and cornrows, fastened with barrettes and beads, and sometimes including shaved sections or bright colour. Sociologists say these styles are an attempt to express individuality and presence in the face of social denigration and invisibility.[47]

Love it
hot immediately smooth easy to use recommended by my hairstylists and well worth the money have not owned a chi so can't compare.
I have purchased may flat irons in the past and the ghd is far superior than all others. Heats fast and turns offwithin 30 mins. If not in use. This is soo worth the money. Thanks amazon
The RUSK Professional Straight Ceramic Tourmaline Flat Iron is perfect for anyone who wants to enjoy frizz-free, kink-free, smooth, silky, straight hair. Now, this baby makes use of ceramic and tourmaline infused plates along with Sol-Gel technology which protects your hair from damage and makes your hair smooth and shiny. It’s very lightweight that you barely feel it as you use it. It gets hot pretty quickly and is really great at making curls.

I was worried that because ghd's are so powerful they would make my hair like straw but they have made my hair feel like I have been to the hairdresses everytime I straighten it I am very pleased with them as it has they are so quick and easy to use and heat up in no time. I would suggest them to anyone
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