I think I'll stick with my beloved Bic Cristals, this looks like an incredible amount of trouble.
I can refill a pen in less than 30 secs if using a converter, 5 secs if I'm popping in a new cartridge. For those that want to go the disposable route, there are several options.
The guy is making it sound more involved than it is for 99% of the FP using community.
And very forgiving. I dragged out a Pelikan I hadn't used in a couple years and found it was half-full of ink, dried ink all over the nib.
Gave it a quick wipe, worked perfectly.
A usable ballpoint or rollerball pen costs at least ~TRY5-10, and it does not last me more than a couple months. Cheaper stuff tends to not be reliable. And it may be hard to find that particular pen again, with the same tip and same feel, whereas with my fountain pen I always know what will happen when I put the thing on some paper.