This is a wonderful liquid liner for the price (and you can always find it on sale somewhere).
I wear contact lenses and have sensitive eyes and this is one of the only liquid liners that I have tried that I have not had a reaction to.
I wear the colour "Blackest Black", which is a true and pigmented black shade (as opposed to other black liquid liners that dry to a soft or muted shade) and does indeed wear all day (a full 8 hour day) for me .
As well, the pen makes the liner so simple to use (which is important to me in the early mornings when I am applying makeup while I am still half asleep!).
I would highly recommend this liner!

This is pretty much my favorite eyeliner ever. I love the look of liquid eyeliner, but I suck at applying it. The pen is super easy to use and looks awesome, like a professional did it. It lasts all day for me. I use it pretty much every day now and I have to disagree with the other reviewer, because I've used mine for way more than 5-6 times and it still works perfectly fine. A must-have IMO.