So for the longest time my favorite liquid liner was Revlon color stay which is a felt tip. Nothing could sway opinion, but then I was watching some beauty gurus use this new(ish) liquid liner from UD that looked so nice and shiny. Revlon's liquid liner is more of a matte finish. Anyways, I bit the bullet and payed the $19, which in my opinion is a ghastly amount for a liquid liner but I digress.
As you can see it is a brush tip which I was unsure about but it's not that bad. Not to toot my own horn or anything but I'm pretty good at lining my eyes with liquid. The brush is flexible but still stiff enough so you have some control.
The only thing I don't like about this liner is that when I blink my eyes right after applying to often transfers to the top of my lids. I try to remind myself to give it a few seconds to dry before blinking.
The formula is very wet and a nice dark black. Overall this is a favorite of mine and I've been using it for awhile.
MUFE has a really similar version that is more expensive, let me know if it's worth the money :)