Good for shaky hands!
I like this eyeliner pen because its easy for me to use. My hands are very prone to tremor (maybe it's all of the espresso I drink) so applying most types of eyeliner can be really difficult for me, but not this one! The firm brush helps keep the line smooth and steady. I rest it against my top lash line and allow the color to reach between the lashes. It dries matte and you can apply two or three layers to intensify the color. It doesn't flake off like some liquid liners do when multiple coats are applied. My only complaint is that there are only 2 colors-- black and brown. Black being my favorite! :)