I really do love this eyeliner. It's super easy to apply, the color is amazing, it's so smooth and sleek looking, and I can promise you, it truly stays put all day. I have rather oily eyelids, and my eyes are slightly hooded. Usually, about half way through the day with other eyeliners, the eyeliner will have transferred onto the hood of my eye from just moving my eyes around (imagine when you get mascara on your eyelid; it's similar to that). Not a pretty look. But with this eyeliner, even if I don't wear eyelid primer, I never have that problem. Even on the hottest, wettest summer days! The ONLY reason I am not giving this product five stars is because, for me, at least, the very end of the application tip tends to always fray and become limp. I wonder if anyone else has this problem? It seems to happen rather soon on, not just when it's nearing the end of it's use. Doesn't really effect the product at all, but after time, it does make it harder to apply it as nicely as when I first bought it. I've recently been using Eyeko skinny liquid eyeliner; I love it almost as much; the tip is a bit nicer, but it just doesn't have quite the same all-day-stay power as Stila's does.