I just got a fountain pen a couple days ago to test out. I like it fairly okay, especially the more I use it and get used to HOW to use it.
Some of the line variation is nice, kinda looks like a brush was used with skill, which I'd never be guilty of.
My biggest problem with it so far after 3 days of using it is the ink is not waterproof, and doesn't work well with watercolor sketching.