Another 8440 has come unto me and I have pressed this one into service right away.
In general I have found the 8440 to be an especially dry and toothy nib but this one has a relatively good flow and does not dig too terribly much into the paper. And, the more I use it, the better it gets. I still write slowly since the feed doesn't quite keep up but even if I forget, it still lays down enough ink to be serviceable.
I have popped the 8440 into a Bell Systems slim J pen for the last few days at work it has been in my breast pocket. I am probably tempting disaster doing this but I will say though that the nib has done quite well. I am a professor and I find that using the 8440 for writing comments literally between the lines of student papers has been a delight. (Yes, I still have students print things and I write on them, dinosaur that I am.)