Earlier quoted context omitted.
I've been using disposable Pilot Varsity fountain pens. They're perfectly decent, medium nib pens that write smoothly. I've never had one leak or stain my fingers, and you don't have to mess with refills. I had given up on fountain pens, as I always had problems with them clogging or leaking or just not being able to find refills. The Varsity has me using fountain pens again. At about $2/per, there's no reason not to…
Personally I like refilling the pen. It is a lot cheaper and you get better inks.
On the other hand, there's Platinum Preppys. I've been using one converted to an eyedropper much of the time for nearly a decade.