I think I bought this for about $3.00 so for that great price, this is an awesome buy. The pen is very user friendly and the felt tip makes it easy to apply and to do cat eyes or winged liner. It glides on quite smoothly as well. It is pretty long lasting as well. I don't know if I would say 24 hr but it does hold up pretty well throughout the day. It definitely is waterproof, I found it really difficult to take off at the end of the day. However, I found it did rub off pretty easily. If I put my face on my arm or my hand, there was always a black smudge. The one thing that I really didn't like was the liner formula. You can't go over a line or it will just completely rub off. The pigmentation always runs out pretty easily and you have to wait for it to get darker, but by the time you've waited the liner is dry and when you go over, it peels itself off. It's pretty irritating. I think I will use up the pen, and I think for $3, it is a decent buy, a good back up to have in your emergency makeup kit, but I don't think I would use this again as my primary liner.

As a student, I try to spend as little money on makeup as I can and for the price of this eyeliner it works amazingly. While I wouldn't really say it is waterproof (it smudged everywhere once when I cried), it does last all day and all night as long as you don't shed any tears. Additionally, the felt tip is great and makes applying wings really simple.