I'm all into eyeliner, on the upper eyelid and below the eye. For the upper eyelid I usually use the cream eyeliner by the Make Up Studio, but I bought this Barry M eyeliner pen on ASOS not that long ago.
This is me after 12 hours at work etc. It's still a nice neat line on my upper eyelid.
It's also relatively cheap at 6,23 EUR.
At the moment, it's unclear how long this pen will last, since I only started using it 2 weeks ago, but all in all, definitely recommended.
(eyes: Catrice Luke Skywalker eyeshadow, Barry M eyeliner, Urban Decay 24/7 liner pencil, Catrice Fake it! mascara)