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I've had a blue Lamy Aion with a medium nib for a year now. Overall, I am satisfied with the pen, I have used it almost every day. I bought it because I was attracted by the design and the nib. About this one, I must say that it has met all my expectations, it is a very different nib from the Z50's and writes very smoothly. However, there is one aspect that worries me, in general the flow is uneven. It never stops, but oscillates between medium and rich. Sometimes, after writing a few lines with an even flow, it seems as if the ink floods the feed and the flow suddenly becomes very rich. My suspicion is related to the converter. There are accounts of Z26 converters working erratically. I have already tried 4 or 5 converters, I have washed them with dishwasher soap. I have several Safari's, an Al-Star and a St 45, on all of them the converter works better, although occasionally the Aion problem reoccurs. The cartridge never fails. I wanted to try the cartridges, but this is where I encountered the first problem. When screwing in the body, I notice that in the last turn it becomes hard and you have to use force and you can feel a metal rubbing. I don't know if this is a defect or a design feature to ensure that the cartridge fits properly. Could anyone who has an Aion tell me if this is the case with their unit? There is no mention of this in any of the reviews. On the other hand, while investigating the flow discontinuities, I tried installing the Z50 nibs and noticed that their geometry does not match the geometry of the feed. The Z50 is much straighter and sits well away from the feed. I gather that the Aion feed is unique to the Z53 nib, but I have not seen this issue noted in any reviews of the model. But I know that there are Aion owners who have installed gold nibs and have not referred to this fact and are even very satisfied with the adaptation. In my experience, the Z50 does not write because the feed is so far away. I have already written to Lamy and after a week, I have had no response. I should add that I bought a broad nib a few months ago to see if it solved the problem. The flow has increased, the writing is smoother, but the flow is still not even. I would say that the discontinuity has even worsened. I recently tried using Waterman Serenity blue and although the behaviour is noticeably improved, it still doesn't go perfectly. With this ink, the medium nib does better than the broad nib. In my observations, I noticed that the inside of the Z53 nibs are very polished. I think this is a feature that does not favour the ink channelling through the slit. The ink does not glide properly. Many nibs have roughness in that area to help the ink flow. But I can't say that the Z53 has a bad flow either.