I am absolutely amazed at this eyeliner. I originally bought it for the brush-type applicator, not the promise of longer lashes. I'd given up on that dream already. However, the stuff inside is what really blew me away, not the tip! I had been using it for a few weeks, liked the color & ease of application/removal. One night while lying in bed with my fiance (after a shower, so I had no makeup on) he asked why I was wearing fake eyelashes to bed. He did not believe that they were my real lashes, he said they've never been so long before. All in all, you really just can't go wrong with this stuff, whether you're looking for longer lashes or a great liquid eyeliner!
compare to eyeko liners
i used to buy eyeko eyeliner (similar felt-tip/marker design) & i LOVED it. perfect size & color. well, they completely "re-did" all of their products including the liners & they came out thinner & more expensive. i bought this to see if i could find a dupe. i'd say it's just as opaque & lasts longer, but the great thing is that there's a mixing ball in the pen that helps continue the flow of product to the tip (the eyeko one dried too easily) i'd say the only downside is the size of the tip. it's too thin for me so it takes longer to build my lines to the thickness i want, but on the other hand, it allows for precise wings. they offer a larger tipped liner, but it's huge. i wish there was one in between.