Great question — answering as the UphillTech team:
I did use one some time ago (this model for reference : https://en.monrechaud.com/kovea-pat-adapter.html ) it did work very well with no leak or performance issues and is easy to use. To be safe I only connected the cartridge at use time, never during storage, the cartridge self seal when disconnected. I consider a good piece of kit as it let me use any available cartridge (where I live easy click and screew on are both available but most store stock only one or the other...)
Full answer by J.R: https://outdoors.stackexchange.com/a/29697 (CC BY-SA 4.0).
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