Good quality. Easy to use. Takes about 6 pushes to get a full fill. Makes inking your fountain pen a breeze. Takes slightly more ink than the cartridge that comes with the Kakuno which I bought it for. If your Pilot fountain pen can fit the larger Con-70N, I highly recommend it. The only con I can think of is that it might be slightly more difficult to clean compared to other existing Pilot converters, and even the simpler cartridges. But overall, I recommend it.