This liner has really great potential, it's not super expensive for a liquid pen and is fantastically easy to use, but it just dries out so disastrously quickly! Within about two weeks of using this liner it had dried out to the point where it was practically unusable - to get any product out at all I had to apply so much pressure that I lost all precision... which is kind of the whole point of liquid pens!!
I also didn't find it to be a particularly rich black, which is definitely my preference.
Don't waste your time, spend the extra $12 and get the Stila Stay All Day.
I was doing okay with my gel eyeliner but I thought there has to be an easier way to build up my usual cats eye look. There is! This has a tip just like the sort of liquid eyeliner you get that screws into a little bottle but I found that sort to be too thin to hold onto and can also get rather gluggy after a while. This eyeliner has no air getting to it which means it's always nice and liquid and is the size of a felt tip pen so is easy to hold onto. Basically you just draw lines onto your eyelids, what could be easier. Much easier than mucking around with gel pots and brushes (which need cleaning with every use) and much easier to control due to the bigger size.
Tips: I draw a line across my top lid lash line, make a dot half way between the corner of my eye and the end of my eyebrow, draw a line up from the corner to that dot. Then draw a line from that half way point across to meet my lash line. Fill in that triangle you have just made and voila you have a perfect cat eye look :)