On the left is the Milani liquid liner brush. To the right (for comparison) is Urban Decay's liquid liner brush.
Milani liquid liner brush -side view.
Yuck! I don't like to apply liquid liner (or even cream/gel liners) with brushes like these. I much rather use a thin liner brush -like Urban Decay's that is the same size at all angles (not something wide and flat like the Milani brush.) The horrid brush doesn't pick up the product well at all -you'll have to go back with a second or third "helping" of liner. Not going over your first line with cause it to look streaky. Call me lazy but I don't like having to line my eyes twice. I even tried using a different brush as well, which worked a little better, but I still needed to go over it twice (also has to do with the formula.)
The Product: Milani describes these as being waterproof and having a "24 hour lasting formula that wears with comfort and color intensity to perfection." I can vouch that these are definitely waterproof and will stay put all day through sweat and tears (not sure about 24 hours but I wouldn't doubt it!) These are a bit difficult to remove even with a good makeup remover and will require some scrubbing. The formula is goopy, thick, and difficult to work with (even for experienced liquid liner wearers.) The color does go on pigmented but again, you'll have to go over your line more than once or it will look streaky. Also, if you mess up and have already applied eyeshadow underneath, you're pretty much doomed. This stuff DOES NOT budge whatsoever without the help of some makeup remover.
The Color: Love, love, love the bright colors that Milani offers but again, the formula turns me off. However, if you're willing to give it a little elbow grease, the colors are pigmented and beautiful.
Here I tried to display how streaky they were -but my camera didn't catch it well. These swatches were done with only 1 coat of liner.