I got a 12 pack of these pens with 9 black and 3 blue this summer (not through
JetPens). When I took them out of the packaging, they wrote horribly-I couldn't
keep a steady ink flow and several times in one sentence I would have to
scribble on a scrap of paper to get it writing again, so I stuck them in a
drawer. Just recently I pulled one back out to try it again and it wrote
wonderfully. It is very smooth and the ink is very dark, and I have had
virtually no trouble with the ink flow. The only bad thing I can say now is
that the ink gets used up fast, but that is because I have been using it for
everything for about a week and a half and there is a noticeable difference of
about an inch in the ink level between the one I have been using and a new one.
I don't know what caused them to not work originally but now they are amazing
and I would recommend them.