One of the best

I love my yves saint laurent liquid eyeliner so much, it goes on easily, dosent have a bad texture and the brush and package is really really nice. Great price also.

It glides on smoothly, amazing quality.
It's the darkest black so you wouldn't need to go over it with black eyeshadow.
It dries really quickly and doesn't smudge so once again you don't need eyeshadow to set it.
The felt tip applicator is so easy to use.
You could have the eyeliner as thin as you want, with other applicators you're kind of restricted and can't go as thin as you want.
Best applicator for a winged eyeliner.