I would say it does work well, and I would expect it to for such an expensive high-end mascara. Black Out is a super creamy, and has a VERY jet-black formula- which is fantastic for a night out. It's a little wet for my taste as I usually prefer a dryer formula (the classic Diorshow fits the bill here) but after a week or two of use is just right. I have not experienced flaking, smudging or running with this product, and have never had a problem with my sensitive eyes. Dior knows how to make a great mascara!