Eyeliner often becomes flaky over time, or when my eyes aren't feeling well, I often end up with tears and it won't even apply, but this product doesn't have either of those problems, and it was a revolution for me. It adheres to the eye over time and doesn't come off easily, but I like that it's easy to blend and correct until it adheres, and that it's great for both thin and thick lines. I tried Fasio's smudge-resistant liquid eyeliner, but the brush was too thick and it applied too much, making it difficult to adjust, so it wasn't quite right for me. This one was perfect.