I picked this up at the Big Bucket Deals sale, and have been obsessed with it! It’s a completely waterproof eyeliner, it’s creamy and smooth and is perfect for the waterline and/or tightline. I use mine only on my tightline (I find dark eyeliner on my waterline closes my eye off and isn’t hugely flattering on me), and it stays put all day.
The above picture is without, and the bottom one is with. I find it makes a really nice subtle difference to a look that’s simply just mascara. It makes the lashes look a bit thicker too!