Real owners lean toward the TWSBI Diamond 580: 77% of 394 owners recommend it, vs 69% of 386 for the Lamy Safari.
Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score
“TWSBI is the only pen I own that you can set aside for months, pick up and use without issues. They are airtight beyond imagination.”— @Erin-Thor on YouTube
“I love them both.”— @ShariArts on YouTube
“I vastly prefer my ECO to the 580. I ended up selling the latter, it just didn't feel or write as well, but the ECO just feels right and doesn't lose anything if you ask me!”— @markdryden8240 on YouTube