I love how this eye liner applies, but not how long the pen itself lasts.

When I first bought it the tip was great, application was smooth and the color is VERY long lasting. However, as time goes by, the end of the felt tip starts to thicken and lines get messier. It's also very necessary to store the liner upside-down in order for the remaining liquid to properly fill the felt tip. Trimming the felt flyaways help prolong the life of this pen.

So while I still love the effectiveness and quality of the liner, I also dislike how soon application loses its precision. Cat eye styles are nearly impossible after a short time, so for that I definitely recommend a pot/brush liner combo.

I've tried a bunch of different eyeliners, but I find myself coming back to this one all the time. It's pretty easy to apply, and it really stays on you. I don't have problems with smudging, and I like that you can get a sharp look with this. Note, though, that the black color seems to work better than the rest. I've tried the dark blue and brown , but they work noticeably less than the black. It also lasts me a while!

I used a Stila Liquid Eyeliner in blue. I loved it so much, I'm thinking about going out and buying every color. The only thing about it is that it's really liquidy. You have to put on one layer, wait about 30 seconds and then apply another layer or its pretty messy. Otherwise, I love it. I LOVE the sparkly blue color I got.

Thanks AGAIN to ChickAdvisor for sending me this as a prize for review of the week!
I got this in "Moss", a really nice green shade. It brings out the green in my eyes and I also like how it works for both day and night without being too over the top.
Liquid eyeliners have always intimidated me a little bit, especially waterproof, because my hands just aren't that steady! But I had to experiment with this, and I'm glad I did. It wasn't as difficult to apply as I always remembered liquid liners to be.
The product goes on perfectly and it's easy to control how you want it to look. The tip is soft and easy to manage and the product stays where you apply it - no smudging and flakes and it is definitely waterproof.
I really like this liner and would purchase it / recommend it to others.