1. Smooth Application: The L'Oreal Paris Makeup Infallible Pro-Last Pencil Eyeliner glides on effortlessly, providing a creamy and rich color that is forgiving of mistakes. Users have praised its smooth application, making it ideal for both everyday looks and bold cat eyes.

2. Long-Lasting Wear: This eyeliner is designed to last up to 24 hours without smudging. Many users have reported that it stays put throughout the day, even in challenging conditions like heat and humidity.

3. Color Variety: Available in shades like deep brown and purple, the eyeliner offers a range of options to suit different preferences. While some users wished for lighter shades, the existing colors have been well-received for their depth and richness.

4. Smudge-Proof Formula: One of the standout features is its smudge-proof formula. Users have noted that it doesn't smudge on oily or hooded eyelids, making it a reliable choice for long wear.

5. Sharpening Challenges: A common issue among users is the difficulty in sharpening the pencil. Many have experienced breakage when using standard sharpeners, though some found success with specific brands like Revlon's universal sharpener.

6. Comfort and Irritation: While most users find the eyeliner comfortable to wear, a few mentioned discomfort when applied to the waterline. It's advisable to test it on a small area if you have sensitive eyes.

7. Removal Process: Removing this long-lasting eyeliner requires a bit more effort compared to others. Users recommend using oil-free makeup removers and gentle techniques to avoid irritation.

8. Overall Satisfaction: Despite some minor drawbacks, the L'Oreal Paris Makeup Infallible Pro-Last Pencil Eyeliner has garnered high praise for its performance, color payoff, and durability. It's a favorite among those who value long-lasting makeup that stays put all day.

*Note: Individual experiences may vary based on skin type and application technique.*