These are amazing nibs. They give an unimaginable variation of lines. I know that these nibs are mainly used for drawing, but I use them for hand writing, writing out huge amounts of text (6-8 A4 sheets).
It is a great pleasure to write with this nib, yes it scratches, yes it is noisy, but what a pleasure it is to write with it!
One sad thing is that good paper is required. Printer paper is not suitable, it makes bleeding.
Best regards,
Marsim Arkadev