I gave this a high rating because unlike so many products, this spray serum does exactly what it says. It imparts, as the packaging states, a "high voltage" shine that is EXTREMELY glossy. I would advise to never ever spray it directly on your hair because that will instantly transform it into a sopping greasy mess. Spray it into your hands and smooth it on. I've only used it in my hair when it's dry so it might not be so extreme if put in your hair when it's damp.
I gave it 4 stars but I won't be repurchasing. My hair is verrrry straight and naturally blonde and this is way too glossy, almost shimmery. I've put it in dark hair and bleach blonde hair and it looks AWESOME. I also prefer serums with some kind of oil in it to moisturize.