I'm looking at the Stila "Art of a Fine Line All Day Waterproof" eyeliners. This set is on sale for $20 on Hautelook (thanks, rawrglicious, for sending me down that rabbit hole, lol), and I'm sorely tempted! Has anyone here tried this line before? Is it good? I haven't tried a pen-style like this before, but I do want to...

Tell me all your thoughts!