I'm so happy I received this as a gift and I didn't pay for it. The formula is really good! Glides smoothly, very dark black color, it doesn't smudge and it's really waterproof. The big cons, is the packaging, you can't sharpen it, you can take more out, but the pencil gets flat and there's nothing you can do to sharpen it again. Impossible to use! So there is, rotting in a drawer.