Works pretty well.  Just a little soft
This shampoo brush is pretty good.  My daughter, who has really dense, course hair, has a different one, so I ordered one of those and this one at the same time.  She tried all three, and all three look alike.  Oddly, of the two of the same brand, one was a bit more stiff (and she says more effective) than the other.  This black one was a bit softer still.  She says it works fine on the top, but not so well on the back of her head, where her hair is denser.  They all work for me, but I have finer less dense hair, so it depends on your needs I guess.  They are all definitely better at scrubbing your scalp than your fingertips are.
Rating: 4 stars