I have been using the waterproof version for years, and use their mascara/eye liner remover to remove it. It lasts for about 10-12 hours before it starts coming off. I like it better than pencil liners, which start smearing, and fading away in half the time.
The eye liner is very easy to apply, compared to other brand's liquid liners that I have used before.
One container can last 3-4 months, but after awhile, the liner doesn't last as long on your eyes, and flakes pretty easy.
Another downfall is, when you remove it, it makes a mess in your sink. The black flakes stick to the sink like glue, and you have to pick it off.
