I got the ghd Heat Protect Spray after I noticed that my ghd straightener was causing quite a lot of split ends and damage to the ends of my hair. And I must say that after a few times of using it I definitely noticed less breakage in my hair! Although it is pricey I do think its wise if you have a ghd to get the ghd protect spray as it has been formulated specifically for the heat of a ghd straightener, therefore providing optimal protection.
Its lightweight and non greasy, and even adds a slight shine to your hair.