A Pilot Metropolitan is approximately the same price and at least in my view, it's better as it uses standard international cartridges. A TWSBI Eco is more expensive, but not by that much, and it's an absolute reliability monster.
A Pilot Metropolitan is approximately the same price and at least in my view, it's better as it uses standard international cartridges. A TWSBI Eco is more expensive, but not by that much, and it's an absolute reliability monster.
I'm afraid not; Pilot cartridges are sui generis, and not compatible with either Lamy's own proprietary design or with "International Standard" cartridges.
That said, there's nothing wrong with proprietary cartridges per se, given that fountain pen cartridges in general are a pretty niche good. I like Pilot cartridges for being refillable and resealable, especially since Pilot makes a lot of really nice inks that only come in bottles, but unless you're anxious to do a lot of refilling that doesn't really count for much.
My daily drivers are a Lamy 2000 with a TWSBI Eco in different color ink for highlighting/commenting; I also carry a Pilot 823 on me as a backup to the Lamy 2000 but I have never been able to get used to the vacuum mechanism.
I haven't tried the Pilots, but the standard cartridge could change my recommendation to them.
The TWSBI Swipe supports both cartridges and converters.