If you're expecting a brush, in the sense of perhaps a watercolor-type brush, and you're thinking perhaps you can do fine strokes, or even have some kind of control over your strokes, this is not what you think it is. This is an over-priced stylus that produces an inconsistent and unpredictable "stroke."
My fat finger gives better control and predictability than this thing. It's double-sided so you get 2 bad styli for the price of, well, for maybe what you'd pay for 2 actual usable styli.
Don't waste your money. There are some good styli out there. This is not one of them.