I love liquid liner! Normal liner, small cat-eye effects, big wings, the lot. After struggling with brush-type applicators, I have found that felt-tip brushes give you a lot more control, so I was interested in trying this product. The pen's tip was a bit longer that I am used to, so it took a bit of getting re-accustomed to, but once I got the hang of it, I was impressed at how easy it was to use! The tip is very fine, so you can easily get close to the lashline and the inner corner of your upper eyelid. It draws smoothly and easily without drying out - it's almost like you're using a normal koki pen! Once on, the eyeliner lasted fairly well, before slowly smudging away. I got a work day's wear out, or an evening/night, but not both. The current formulation is not waterproof. When that comes out, I'll be repurchasing!