I've been using this pretty much everyday for about 6 months. It's my preferred eyeliner now. I find it glides on really easy, makes it very easy to do a subtle kitty flick, and doesn't spread or bleed like many of my past liquid eyeliners did. It isn't so great on the waterline, as it tends to wash off quite easily - it is not waterproof. A previous review found their line was a bit patchy. I found that with my first pen after about a month of continuous use. I then started storing it upside down (point downwards), so the felt tip doesn't dry out, and I found that improved the quality of my line.