TLDR: It’s compatible with other copy-left licenses like GPLv3. However, it’s available in multiple languages, which technically makes it more applicable.
I started using it for my own project. If you want a practical example: https://github.com/TimoKats/emmer
I think this is a very useful license to require in new software procurements commissioned by public entities in the EU. The FSFE calls this “public money – public code” (publiccode.eu). Having a specific EUPL over just the GPL might make this look more proper, even if there aren’t many technical differences. However for personal use I would prefer using good old GPLv3.