As for the nibs, I'm a cheapskate (obviously) and buy lots of the Jinhao no.6 and no.5 nibs to tune and put into other fountain pens. Most of them are very usable as soon as they're delivered. Some of them are beyond my abilities to tune. But the majority of them are awesome...
They were comfortable to use. The pens were so big that small fingers and arthritic hands could easily hold them and write with them. They wrote well — a nice medium blue ball point pen that was smooth to write with and flowed nicely across the page. ...