This is the only eyeliner I use anymore. I found it in a Dollarama in Canada eons ago and have been using it ever since. I literally never fuck up my eyes when I use this pen. I've been told that you can find them in some Shoppers Drug Marts as well, but definitely look for them in any dollar store 'cause, obviously, they're way cheaper there.
I used to only use this eyeliner in the summer, since it's really great in hot weather and it doesn't come off as you sweat (it's gross to imagine my eyelids sweating, but let it be known that it does infact happen) - but now I just use it year-round since I've come to love it so. I like the ultra black one, since, well, who the hell uses brown eyeliner? Weirdos, that's who.