I have used the serum primarily in damp hair after washing. It really feels like it helps to smooth and soften the hair. Almost a bit flat iron feel even though it’s just air-dried. Very luxurious feel, especially with the heavy, solid bottle. I also tried it once in dry hair, before heatless curls that I slept with overnight, that turned out very nice too.
At first, I couldn’t decide what I thought of the scent. I often like the scent of Kerastase products, but sometimes I’ve found some of them to be a bit "deep" (I usually prefer fresher scents). But I feel like this one has grown on me over time, and now I associate it more with how hair can smell after being at the salon. But good to know if you lean more towards the fresh side.
All in all, very satisfied!
(For your information, I also use shampoo + conditioner from Kerastase, so that probably affects it too).
I am participating in a test panel and received a free test product.