I got mine in "Warm Black" rather than "Ultra Black" and it wasn't a good choice. It looks like a watered down version of a normal black eyeliner. Brush dried up rather quickly as well.

Comes with built in removable sharpener. Easy smooth application and removal, easy to smudge though so depending what you're going for it may or may not be for you.

I have used this eye liner for a while now. It's asy to apply and remove. The applicator is a felt tip. There is no smudging or smearing, and dries fast. It's great for creating thin line definition or Cat eye look.
I don't like that the felt tip dries out really soon and at times I have to push the tip against the lid to get the liquid flowing in the tip.
I bought 2 of these together, however I won't be investing more into it.