These brushes use tilt sensitivity to control brush rotation, so you do not need to use the Art Pen. After using both rotation control of the Art pen and normal tilt control for rotation, I have found that tilt control works just as well, and is even a little more natural to how you would rotate an actual pencil. Also, I found that the Wacom Art pen lacks pressure levels compared to the Wacom Pro Pen 2.

I still can't quite get used to doing these on a drawing tablet