This has been called a dupe for the Anastasia Beverly Hills brow pencil, and although I've never used that particular one, it's been very hyped.
I have used the Stila version and the Soap & Glory one from the UK, both of which are fabulous. With one of these being double the price, and the other only being available overseas, this one wins by far, as it's not only affordable and easy to get, it's better than both!
With a spooly brush on one end, and a super fine tipped pencil on the other, it can be use to line and fill brows as well as mimic hairs, and you can brush the product through when you're done too. I've used two up and am due for another soon.