This was a fail for me. My eyelids are no longer smooth and firm, so it's almost impossible to get a straight line with a liquid eyeliner, and this was no exception. And why you would want your eyeliner to last 36 hours is beyond me, please clean your face!
All that aside, this product seems to have a couple of good things going for it, but otherwise it's pretty much the same experience as with other liquid brushtip eyeliners. There are a number of other cheaper brands which are as good as this one in solid colour that sticks to your face.
They made a good decision on the brush tip applicator. It's short and slightly firm so you have good control over the line.
To test their 36 hour promise, and their sweat/smudge resistant sales pitch, I drew a circle on the back of my hand. It stayed for an hour or so, then I went in the shower and it still stayed on. However when I emerged to get dry, one little knock of the back of my hand and the circle became dislodged, showing that instead of being a sort of sticky paint, it's more of a plastic that peels off intact. When I wasn't trying to test it in ways it wasn't supposed to be worn, I put it on my eyelid and proved that a) it does make a good black line, and b) I can't apply liquid eyeliner to the standard I expect to see on someone's face! Crepey eyelids not withstanding, you also need to have good eyesight!
So while point B is not the fault of the manufacturer, these are the reasons I won't be buying this for myself.
I dont use gel liners often as i have hooded eyelids and if i do its usually a pen but this is a great formula and i think i could use it going forward with some manipulation.
Brush: The gel liner come with a long tipped brush end, which can take some getting use too, i almost felt like getting out a angled liner brush and giving it a go that way to get the straight lines. Mind you i just cant use the long brush tips no matter how hard i try.
Packaging: great sized tube and definitely alright to hold when applying
Formula: Deep black which is ACE! and lasts definitely for 36 hours. It is easy to remove as well which is a bonus and did not irritate my contact lens wearing eyes.
Probably would not buy again but that is personal preference for the gel pens rather then brush ends :)