I actually received this one months ago as a sample. And I absolutely LOVED every bit of it. Lets say loved it so much, I even bent the tube in half just to squeeze out more of it out once the exposed tip was used, and I fell HARD when Birchbox sent me 5 OF THESE THINGS in my December box as a Christmas gift! Squee!
I am a major fan of eyeliner, but pencil eyeliners tend to itch and irritate or pull at my skin (it accelerates aging. NO WANT!), retractables are ready to break and end up becoming slippery and unreliable after a while, and liquid eyeliners are nice but a pain to manage before they can properly set.
This eyeliner glosses (eyelines?) right past all of these issues. I get to apply it with enough time as I please with no worry of clumping or unflattering results from drying, and I can BLINK without fearing it getting messy, all while there's no feeling like I'm advancing the age of the area around my eyes. The best part is that I can really smoothly apply it to my upper eyelids too, which tends to be super hard for me. And it smells so nice, so even the act of applying it makes me feel like I'm getting elegant! LOVE IT!!