The Killer Kajal Eye Liner by Too Faced is Olivia's favorite eyeliner. She loves the dark bold color and appreciates that it stays on her waterline all day without smudging. This eyeliner provides a long-lasting and smudge-proof formula, ensuring a flawless look throughout the day. Its intense pigmentation adds a dramatic touch to any eye makeup. However, it's important to note that the review does not mention any potential drawbacks or limitations of the product. Overall, the Killer Kajal Eye Liner by Too Faced seems to be a reliable choice for those seeking a bold and long-lasting eyeliner.