Ah, I can't really answer your question, Tor. I remember when Syd Saperstein first introduced this venture. The pens always appeared to be topnotch with great attention to detail; however, they've always been above my pen budget and I have no first-hand experience.
There are numerous pen reviews and videos online if you do a web search, but I haven't seen discussion about vintage nibs fitting into the modern pens. Good question.