Maybelline's gel eyeliner is comparable to MAC Fluidline. In fact a few of my friends have told me they think it's actually better, and it's cheaper too! The Maybelline product retails for around $8-$10, and it comes with a brush.
I've recommended this product to a handful of friends, and they have all agreed that it's awesome. Readers, what about you? Have you used it before or do you have another eyeliner that you swear by?