I wrote to Jon just about six weeks or so ago asking about the possibility of integrating with Mellel. He immediately responded with a "just wait a bit...we're working on this." I also wrote to Mellel about it with my enthusiastic vote for that new wrinkle (see my review under Mellel). This is a wonderful example of excellent Mac software that integrates with another example of committed development to the platform.
Bookends is fast and easy to navigate. I have a Filter that culls the data from the database at my university's library catalog and dumps into my Bookends. So easily done.
I once used EndNote but got tired of their ignorance of the Mac platform. Jon responds very quickly to questions and suggestions. If you need a bibliography program this one is absolutely worth investigating and using.