I find it quite difficult to use, to my great surprise! I’ve recently written a long letter with it and every top of the page it behaved well, wrote smoothly, great line variation. Then by the bottom of every page it would start scratching and skipping. Clearly I somehow must be rotating the pen as I move my hand down the lines but it must be tiny movements because I don’t see any difference myself! Anyway, the stub is much less tolerant to changing angles and rotation compared to a regular round nib.