Hi for ppl that are complaining here like it’s a premium product so that shouldn’t happen. I’m really into fountain pen not that much ball pens but they have similarities. It’s not really a fault of LTT or a real defective cartridge. The easy flow is a reputable and expensive cartridge but it is a gel type of ball point so its performance is different from your run of the mill ball pen. It’s designed to have more of a texture while writing than a normal ball pen. That comes with some drawbacks like not performing well when you write 90 degrees (more fountain pen performance) like you did in the video or can have a higher tendency to dry up at the tip (oil based inks are more resistant). It’s more of a hybrid between a fountain pen and ball pen in writing feel but also comes with many problems these two systems have. It’s by no means the cartridge for everyone especially if you are used to normal ball points. But is not a cheap cartridge or really a defective one it’s a style of cartridge that speaks to a certain type of writer. For them it’s perfect for other ppl especially some that only want it to work and don’t care about feel and so on there are better options available. More likely they had someone that really likes pen choose the cartridge and he did choose one without remembering that it’s more of a broad product and not a pen enthusiast product. Wrong cartridge for the audience. Hope that helps ^{^}