I began using this, originally, because it was safe for contact lens wearers, and not all of them are. Some eyeliners will irritate your eyes/contacts, but this one does not. It is one of the cheapest eyeliners I could find, and lasts a long time, applies easily, and holds up well after applied. I work outside, and it holds up pretty well, even in hot conditions. I've tried several of the colors, but only the black onyx seems to apply thick and dark enough for me. The blue, green, and brown, didn't seem to have as much saturation of color, and seemed a little more waxy and harder to apply. I have dark brown eyes.