Review (5/5): Excellent results
I had great results but I didn't follow the directions exactly. I used the included brush to paint some Vaseline around my eyebrow (outlining it but not touching the hair). This keeps the dye from staining your skin outside your eyebrow. Then I used a mascara wand (the disposable kind you can get as samples) to apply the dye. This let me brush the dye through the eyebrow hairs rather than slather it onto my skin.
I left it on for 4-5 minutes and got a perfect shade of dark brown (not quite black). If it stained the skin under my eyebrow, it isn't noticeable. The whole process took under 10 minutes. The capsules have powder dye, so I was able to cut it open and only use half.