It's a bit faster and easier than parquet, but right now the format is unstable, which is a huge downside and makes it unsuitable for medium/long-term storage.

It's a bit faster and easier than parquet, but right now the format is unstable, which is a huge downside and makes it unsuitable for medium/long-term storage. After DuckDB v1, they'll keep the format stable and then I think its popularity will increase dramatically.