Can't use fountain pens coz the scratching of the nib goes right through me...
Funnily enough, I find my fountain pen a bit scratchy. What's really bad, is Ripster's recordings of buckling springs -- the scrape of the spacebar sounds just like when you get your teeth scraped by a dentist! Argh! (No idea why spacebars sound so bad in recordings.)
I used to use disposable rollerballs a lot. The daftest one was, I think, the blue Pentel 0.5 mm -- after a while, the ball would wear itself loose, and then unceremoniously drop out onto the desk and roll away. After two of those, I decided they weren't a good idea any more.
I seem to recall that the Pilot Hi-Tecpoint was good, but for whatever reason I got into UniBall Eye micros (0.3 mm) -- such a gorgeous shade of blue. Wish you could get the full colour set in micro instead of medium, as I write very compact, fluid script that doesn't work well with 0.5 mm and makes me write larger and wider.
Fountain pens also have an irritating habit of only having 0.5 mm nibs -- I put this to
Cult Pens and looked through the list of recommendations in the guy's reply that took 0.3 mm nibs, and picked the (petrol blue)
Tombow Object as the most elegant and reasonably priced (I think there are designs I'd much prefer, but not at 0.3 mm):
Always nice that, for those of us who are a little particular, someone is there to offer personalised service! Just like The Keyboard Company.