The formula and the brush are superb. It glides so effortless. The brush doesn't fluff and the tip doesn't dry out. I'm able to get perfect wings in a heartbeat with it. And it doesn't stain or make mess, so it's easy to clean up or fix mistakes. Its is not a jet black like some western liners, bit its common for Korean liners. It dries mat and gives a nice natural look. It wears with no issues for 8+ hours under normal conditions, but not going to withstand a day at a beach or a workout. Overall it's a great liner for daily use.