I love it! Fantastic leave-in serum from Kérastase. As a big fan of the Extentioniste and Nutritive series leave-in products, I find that this one is very similar to them, both in texture and finish. I use the serum in combination with my leave-in conditioner and notice that my hair becomes even shinier, fuller, and feels noticeably stronger. The ends stay soft and hydrated without any signs of dryness or split ends. My hair is also very easy to manage when blow-drying and styling. Highly recommended. This serum also has heat protection, which is great since I am very particular about having heat protection in almost everything I apply without washing it out of my hair - the more, the better, I stock up on heat protection so I can be sure that every hair strand is covered with heat protection when I blow-dry/style, which I do every other day.
I can add that I have long straight hair (Asian).
My hair generally takes longer to dry, I am oily at the roots and use detox shampoo often, so I add some leave-in products and other things to the lengths to compensate.
I am participating in a test panel and have received a free test product.