The short brush applicator is very interesting. It's super fine and makes applying pretty easy, so that's good.
As for the color, it's much darker than I expected. I thought it would be a brighter, more electric blue. This color is a solid medium-dark blue which is still nice, but didn't really pop when put over black eyeliner.
Also, it's not waterproof, which makes removal easy. Just be aware when you apply.