I don't use mascara on a daily basis, but whenever I use masacara, I'd use this Dior product as a primer. Very easy to use and does not clump. It has become one of my staples.
I've been using this for years and I can't go a day without it. It gives you that extra volume and curl. I find I don't have to use so much mascara with this product.
Started using this product instead of another lash extender product and really love it. For me, this is the best there is, and it's worth the price. Really makes lashes thicker and mascara more lush. I don't know about promoting growth, but I love my lashes.