I picked this up in a vault, and - let's be real - would *never* pay $50 for a liquid eyeliner. My fave KVD one is only about $35.
However, for the purpose, this is great. It's a very easy to use eyeliner, with a great brush tip. It's a little liquidy, so don't do what i did and tip it up so the liquid runs out. not a good idea!
The liner, once applied, dries black, with visible flecks which I think must be the magnets. These are only visible in certain light; it looks black on the lids.
The lashes will pull off a little of the liner, so moving them a lot may require reapplication. Dry time is short, and it wears well - i put some on my hand to show a colleague and it was still there the next morning. It came off easily with my oil cleanser, though