NYX Wonder Pencil, along with a couple other NYX products that I'll be reviewing soon. They have a reputation for producing relatively high-quality products at a great price, including a lot of dupes of more expensive products.
I don't use it for covering the circles under my eyes, because I still feel like my Urban Decay concealer pencil is better for that, as the thicker pencil makes for a quicker application.
The Wonder Pencil has a really smooth, easy application and seems to hold up well to being worn for dance. It keeps creamy lipstick from wandering when used as a liner. It's really affordable, really versatile, and easy to throw in your dance bag for quick touch-ups. I'd call this one a win!