Pretty nice to use, once you realise the functionality is hidden away a bit (use Ctrl+Alt+C to open the sidebar).

I wish it had an option for Biblatex as well as Bibtex, as that has a specific "@online" type. The "Updated" field is often inaccurate as well, just set to the current date. Generally speaking you need to proof read any citations this add ons produces as it often has to guess the author name and gets it wrong.