Please tell me some features of Jane cosmetic eyeliner?

I always wanted the look of my eyeliner to be smooth and well defined, so that it does not show any rough or uneven edges. But the eyeliners that are advertised in the market are not that satisfying. I brought two of them but none of them was up to my expectation level. Then my friend told me to try Jane cosmetic eyeliner. This is the first time when I heard the name of such a cosmetic brand. I want to know that what are the features of jane cosmetics eyeliner which makes it different from other eyeliner?