This is possibly one of my favourite media the reasons being in that they offer control and practicality.
On the practical front you can smuggle them into any museum and gallery with-out infringing their ‘only pencil’ rule and then when you get back home you can magically turn your drawings into water colour paintings using your water brush.
For me a water brush gives a far greater degree of control compared to a standard brush so you can control exactly how much of your drawing you want to apply water to.
In my drawing of two angels the one on the left I have used a water colour brush and the one on the right is just with water colour pencil so you can see the difference.
One final note it’s worth spending that little bit more to ensure you get a better quality. This will reward you with brighter more intense colours.