I've been twirling pens since my college days, but I never managed to smooth out my technique/execution. When I did the twirl, there wasn't any pleasant flowing motion, but I did manage to fling the pen halfway across the classroom.
Just a few days ago, I read a thread on reddit about a ring skill that was in the movie Prestige. This was in one of the most upvoted comments, a link to a tutorial.
It's been only a few days since I first practiced, but I'm actually learning really fast. The only thing I need to work on next would be speed and consistency.
I guess I'm more of a ring person, but I'm willing to train and learn more pen and coin skills.