Noise is a complete STAR when it comes to displacements and need a slight fuzz to it, or a short furry(ish) effect depending on how you route it through to the displacement node.  I haven't got too far into this as I'm learning by trial and error and just trying stuff to see what does and doesn't work and what some of the functions do.  The math function will be my next toy.  Now we all know why I haven't had any new product out, I am too busy learning and having a blast in the process!