We don’t know too many people that are using their hair straighteners vertically, but there must be a few since ISA has made a point of clarifying that this model is intended only to be used horizontally, i.e., perpendicular to your hair. According to the manufacturer, using the hair straightener horizontally reduces hair pulling for a more comfortable experience. This may be particularly important to you if your hair tends to knot easily or you have unruly curls and texture.
Super fast heating up! I just turned it on, and I couldn’t believe it’s ready to go when it started beeping. My hair is on the thick and wavy side, and I’ve never been able to finish straightening it this fast. It literally takes me between 10 and 15 minutes. It also doesn’t burn my hair, or give it that awful burnt smell. I really like the bright shade of yellow. Definitely would recommend this GHD hair iron