Is this the one you're talking about?
https://www.indy-pen-dance.com/jowo-flex-nib.html
If so, I have a Richard Binder 14K flex. I reviewed it
here along with the pen it's in.
I don't have any of Linda's nibs yet, but as far as I've heard she's ably carrying on the work she learned from Richard (and on her own of course, she's been at it a long time!)
My nib performs as ably as any flex nib I've had.
The other pro-modded nib I have is a Mottishaw. See nibs.com and look at his flex and Spencerian modifications. I got the Spencerian mod on a Pilot 912 FA.
I'm glad I had 5+ years of practice with flex before getting this nib. It requires an expert-ish hand and performs like a fighter jet.
hope that was helpful, hit me if you have any questions.
also, if you're willing to be vigilant about pen hygiene, a G-nibbed pen from Pierre at Desiderata will do quite nicely. I had to give up on G nibs, I let them sit too long and they rust.
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