ZIG Cocoiro - Extra Fine Flex Refill

My first ZIG pen would dry up quickly if I paused writing, and would be hard to get going again. I almost gave up on it but when it worked it was SOOO nice! Now that its broken in more (?) it works more consistently. Meanwhile, I bought these refills because I do not want to go without it, plus a few more bodies. All my new pens are working without a hitch. The only reason for 4 instead of 5 was the original issue, but they seem to be working great now. And - like I said above - they have a wonderful feel. I love the flowy lines and varied thicknesses I get so easily.