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Have someone actually used it? Any feedback? There are a lot of alternatives at the moment, all of them break on complex excel documents

Hello, try this one: https://github.com/docling-project/docling.rs It loads .xls, .xlsx, .csv and 50+ more formats

And you could even try it online in browser (no any data sent to server): https://docling-project.github.io/docling.rs/