As i've mentioned in many other posts, i'm a complete fiend for liquid eyeliners; i learned to use them back in my Punk Rock Girl days in the mid-1980's and i've never tired of them.
When i got a bit older, i branched out from the requisite black and ventured into the different colours that became available. Back in the day, NARS came out with these amazing liquid-gel eyeliners in these little glass jars. They were new and different because their texture was somewhere between - as i said - a liquid and a gel. The came with a little brush and the colour selection was incredible. I was in love with those liners, and had one in every colour.
For whatever reason, they were discontinued sometime after 2007 (i'm not entirely sure - during that time i was taking a break from the cosmetics industry and dealing with other things) and for me, eyeliners have never been the same. I miss them.
Then, NARS released their version of a liquid eyeliner pen - it was pretty horrible. The formula was thin, weak and runny. I was crushed.
And then, in 2011, i believe, they reformulated the eyeliner pens and released the current Stylo Eyeliner. Apparently they listened to their customers, because this new version ROCKS. Every liquid eyeliner pen i ever try is compared to my Holy Grail, Le Metier de Beaute's Precision Eyeliner - it's a tough eyeliner to live up to. NARS Stylo is very close, in my opinion. Like the LMdB, the Stylo is opaque yet buildable, applies smoothly and stays on my oily lids all day. The ONLY complaint i have is that when my eyes get watery in the corners, it can smudge just the teensiest bit - which the LMdB somehow manages to never do. BUT. This is only under the extreme conditions of my allergy-riddled eyes when they're really leaking up a storm.
For instance, today my eyes do have a bit of the watery thing going on, but the NARS Stylo hasn't budged yet. It's not a waterproof liner, so that is pretty impressive, really.
Another really nice thing about these eyeliners is the colour selection. There is, of course, the requisite black (Carpates)- but they also come in a navy blue (Atlantis, shown below), rich, lightish brown (Nuku Hiva), and grey (Koala). I find the brown one to be a bit too light, even bright for my tastes, preferring a darker, cooler brown. However the rest of the shades are really gorgeous.
NARS Stylo Eyeliner in Atlantis