1. Smooth Application: The L'Oreal Paris Makeup Infallible Pro-Last Pencil Eyeliner is praised for its creamy smooth application, providing rich color that glides on beautifully. Users appreciate its forgiving nature, making it easy to correct mistakes during application.

2. Long-Lasting Wear: This eyeliner boasts a long-lasting formula that stays put for up to 24 hours without smudging. It performs exceptionally well even in challenging conditions like heat and humidity, making it a reliable choice for all-day wear.

3. Color Variety: Available in shades like deep purple and dark brown, the eyeliner offers a range of colors to suit different preferences. While some users wished for lighter shades, the existing colors are highly pigmented and provide a rich finish.

4. Smudge-Proof Formula: One of the standout features is its smudge-proof capability. Users report no smudging on the top or below the eyes throughout the day, though some fading may occur over time.

5. Sharpening Challenges: A common issue noted by users is the difficulty in sharpening the pencil. It tends to break easily, requiring a high-quality sharpener like the Revlon Universal Sharpener for optimal results.

6. Comfort and Irritation: While most users find the eyeliner comfortable to wear, some mention discomfort when applied on the waterline. However, it does not cause irritation for those who do not wear contact lenses.

7. Removal Process: Removing this eyeliner requires a bit of effort but is manageable with oil-free makeup removers like Neutrogena's product line-up or Vaseline-based solutions which effectively take off all traces without much hassle