I naturally have blonde hair so I need to put something over my eyebrows, otherwise it looks like I have no eyebrows. I used to apply black mascara over my eyebrows and then switched to applying gel liner for a more defined look. But the gel liner would be smudgy so I switched back to applying mascara. And then switched recently to using just a dark brown eyeshadow with an angled brush for a more natural look... but it still wasn't hitting the spot.
I tried it this morning and I have to say that I was impressed and loved the results (shown below). It was actually easy to apply, although I had to put a little more pressure on the pencil than I thought I would have to. But it worked nicely and can be built to your desired intensity. So contrary to any of the other products I had tried before, I could adjust how intense and dark I wanted my eyebrows. After applying the pencil, they recommend using the brush to smooth the product in and that made my eyebrows look more natural.
They also have different versions of the product that have different shape and size of the pencil, depending on the look you like for your eyebrow.