El Placed on 18-01-2023 The converter holds a good amount of ink, and fits snugly into the Faber Castell Grip. It is easy to use. I have not experienced leaks. I prefer it over cartridges.I deduct a star because it is nigh impossible to disassemble completely, and if (when) ink (or water when cleaning) gets behind the seal, it's not possible to get it out in any easy way. I want to be able to use bright inks as well as darker, and I don't dare do this unless a converter has been completely cleaned and dried.But, if you use only one ink, or of the same hue, and especially are less nitpicky than me, this should not be a problem.