I'm not a frequent user of Fountain Pens, but, except in the cases where I use a mechanical pencil, I would rather use a FP than anything else.
I have about 50 pens, but I only have one or two inked up at one time. Usually just for practice and for my journal.
I have 9 Pilot Varsitys in 7 different colors, 6 Cigar shaped Sheaffer school pens, 3 Sheaffer pens, 3 Sheaffer Viewpoint pens with calligraphy nibs, 3 Jinhao 611, 3 Baoer, 3 Jinhao 450, 2 Beifa, 2 Bal Xin 538 2008 Olympics Commemoratives, 1 Slilcraft Executive, 1 Pilot Plumix, 1 Jinhao 250,1 unnamed Parker, and 11 unmarked pens.
I'm still waiting for a Jinhao 599, a Hero 301, a Hero 3019, and a Jinhao 126.
My penmanship is awful. I practice, but it never seems to get better. It doesn't matter. I enjoy using them.