I have a badger - it is just a regular model car type brush. Not specifically for cake. It works great for me. I also have a cheap $20 airbrush that came with my compressor and that works well, too. Actually, my badger is broken right now, so I am using the cheapo and it does just what I need. But, I don't airbrush pictures or flowers - I'm more of an airbrusher if I want a red tier or if I want luster dust on the cake.
I love it.