I was skeptical buying this on amazon but with some of the other reviews I took a chance. This is authentic product and with that of course lives up to the ghd reputation I was able to register it on their website without a problem. They needed the number on the hologram and the date numbers on the inside sticker. I have attached pictures. Note I was not given this product ot any discount I simply wanted to give my feedback.
If your hair is fine, fragile or damaged you have to be careful with the temperature. Your locks require the lower heat to reduce the damage. The maximum heat level that you can apply on thin or damaged hair is 350°F. But maybe you should start with lower temperature, something like 170°F – and see if this would work. Also, thin damaged hair requires a flat iron with narrow plates so that you will be able to straighten it in one pass.
I read lots of different reviews about these straighteners and a lot said these aren't genuine. They are definitely ghds just professional ones which means they are lighter. They are exactly the same ones at my hair dressers. I'm happy.