This eyeliner was recommended to me by a friend, and since I haven't used any other liquid liner. Before using, know that you can't make many mistakes with this stuff and get away with it. It's similar to a temporary tattoo, except it takes much more scrubbing to get it off your eyelids. You have to wait for the product to dry before blinking because you could cause the eyeliner to leave an imprint on your eyelid crease. Other than the initial terror of making sure you get the line right, this eyeliner stays as long as you want. I've worn it on hot summer days and it hasn't moved an inch. And I have oily skin and eyelids, especially when I sweat in the summer :). As previously mentioned, it is difficult to scrub off and can flake if not removed correctly. While this eyeliner needs maintenance before and after wear, when you're wearing it you don't even realize it's on and can go through your day without worrying about smudging.