Oooh, that sounds like a great product to have! When I read your post title I thought you were going to talk about getting eyebrows permanently tattooed--my older aunt has it and she looks straight scary! hahahahahha. If done right, it can look good I suppose. But yes, having it as an actual pen type of item seems like a much more appealing alternative!
How much did it cost? I would love to have the link whenever you get around to it! How did you find out about it?