Review (5/5): I love this!
This eyeliner pen is exactly as advertised. Very easy to use, and a very subtle but glittery color. If you use a ton of it, it's definitely noticeable, but you can also use it more sparingly to get a good highlighted eyeliner effect as well. It also has real staying power. I swatched per normal with makeup on my hand and it didn't come off even after I vigorously rubbed my hand against my clothes.
So in all I love the look, it's easy to use, and it lasts so it gets 5 stars in my book.