Right now, I am loving the Gel Eyeliners. I find that it's easy to apply, it sets very nicely and does not smudge.
It's an alternative to liquid eye liner for those who don't like or have not mastered the application with liquid liners. I feel you can still get the same effect with gel liners as you do liquid.
I have been using Maybelline's Eye Studio Lasting Drama in Black. I find that I can get a nice dramatic effect on my eyes.
I bought mine for about $15-$20(can't remember) but managed to find some stores online that sell it for $10 - Amazon, CVS Pharmacy, Drugstore.com, Bloom.com, Walgreens, Purchase Direct - just to name a few.
It's perfect to wear on it's own or if you want to make a bold statement with your eye make-up.
I think I have officially ditched all other eye liners for gel - I love it!