I'm not much of an artist but I still enjoy a bit of doodling and I still much prefer doing initial designs of almost anything on paper before going anywhere near a computer.
I'd seen and heard good things about brush pens so I picked one up from Amazon, out of curiosity more than anything else, and am quite enjoying it so far. It definitely takes a bit of getting used to as it is almost nothing like drawing with a normal pen. These sketches are literally the first quick tests I did with it, though, with no real idea at all what I was going to draw, so they're not utterly disastrous and I'm quite hopeful that I'll get used to it eventually!