This is one of my favorite nibs. It has just the right amount of flex so that you can create really thick downstrokes and fine hairlines. This nib glides really well on paper.
This nib uses the Speedball "C" holder so the holder is a little smaller (narrow) than the standard Speedball holder. Since I have clumsy hands, it took me some time to get used to the dainty pen holder.
The only drawback is that it sometimes snags on the upstroke, especially when I am writing letters with a descender like "g" or "y." I try to pay more attention to what I am doing when I am writing, and I go slower when I am making these letters, but I sometimes forget and will get a little splat of ink.
I love this nib!