Review (5/5): Easier than expected
I like this a lot. My typical brow filler of choice has been powder with a brush, but this is now a contender for first place. (Pencil is 3rd choice.) This brown pen color stayed in place all day, even through a workout and me touching them during the workout. I got the dark brown/chestnut and wish it was a little darker, but with my current hair color, this works better than black would. I made up the color difference by just applying it all the way through the brows (not just on the gaps), which looks great and even looks pretty natural.