I love this eyeliner very much. Its doesnt smudge and stays in its place for longest time. Its a water proof liner. I use it as a liner and kajal both and it work great in both ways. It even comes with its own brush. And I like the fact that its brush has a cap which make its hygienic.
The only thing which I dont like about this product is that its dries out really fast. So if you are the one who uses liner occasionally then most of the product will get wasted because it wont work properly once its dried.