This is available in 17 colors, in varying shades and in metallic or regular finishes. The two that I swear by are Espresso and Caviar. Espresso is a coffee color with no hints of red at all, and is enough to define my dark brown eyes. (I usually cannot wear brown liners because I need a lot of eye definition.) Caviar is an even darker brown, almost black... so pretty!
$21 for a little pot seems a little expensive, but even with daily use, I've still had my Espresso one for like 6 months, which is way longer than some pencils. I'll probably throw it out within the year, though, just because the idea of dipping a brush in there every day seems very bacteria-ridden. (I am also the girl who throws her mascara away exactly at 3 months, if not sooner!)
Definitely try this! You're guaranteed to find a color you like, and you will be pleased with the lasting power and results!