It worked very well, as I mentioned, Marc21 (the interchange format for bibliographic data) is heirarchical, not relational, so there was already a better impedance match.
Then with URL's being the primary identifiers, it was trivial to take a large dataset like VIAF (Virtual International Authority File - canonical representation of all authors) and query the two together seamlessly.
Virtuoso was a pretty good Quad Store, and we got away with storing tens of billions of triples on a 4 node cluster, with very fast query times (although sticking to Sparql 1.1 and not leaning on property paths).
As to if I would choose it again ... I don't know. I'm now a decade out of the library space and haven't seen anything in my day-to-day work (backend distributed systems) that would benefit from the RDF data model.
