I don't particular like this pen nib. It is very stiff and you need a lot of pressure in order to get thin hairlines and thick downward strokes.
I think this would be good for individuals that want to use more pressure when writing and have a heavier hand when doing calligraphy.
This nib takes a special holder by Speedball and uses the "A" holder which is thinner than most pen holders so it feels different in your hand.