I really want to love the Easyflow 9000 cartridge. It’s just enough like a gel pen to have the line quality I want, with the feel of a ballpoint. It’s in the Parker format, so it fits a lot of pens, including the Caran d’Ache 849 (affiliate link), which I like.
The problem is that it has the most frustrating flaw. The ball sticks. Ok, I don’t know if it’s actually sticking or if there’s some other problem, but it feels like the ball is not quite round, and sticks in the socket from time to time. There is an intermittent binding and chattering. It was worse when the cartridge was new, but now it’s almost more annoying because I get used to a wonderfully smooth experience and then the thing binds up – it’s like running barefoot on a beach, and once every half a mile landing on a sharp rock. Enough to get you to stop running on a beach.
The memory of how nice it can write gets me to pull it out from time to time, and in a short while I remind myself why it’s in a drawer.
It’s possible that the two cartridges I got were flukes, but I’ve read similar comments elsewhere. If Schmidt can get the fit of the ball improved, they will really have a winner with this cartridge, but until they do it’s a loser for me.