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Paper filters definitely produce a better quality cup, but I like the convenience of not having to worry about how many to pack, whether they'll get crumpled up in transit (or somehow go missing).
With the metal one I can at least just store it in the aeropress for the travel time (I imagine long-term that may do some damage to the rubber plunger). Picked up a Koffi branded metal filter a good 10 years ago and it makes pretty decent coffee. Just need to make sure you don't fall back into the habit of knocking the filter + puck into the bin.
+1 but with paper filters - best coffee you'll get on the road IMO and only needs boiling (or close to boiling) water. Up for trying a metal filter though. I don't need to weigh to get good coffee with this setup.