I think this is a very promising vector application - in comparison with its competitors it is more intuitive and has more funcionality that I can use.
It has a weakness on import/export formats. It only supports EPS import, no other formats.
This is the best bibliography app on the mac platform. Sente is a bit more elegant in the UI and has some cool features, but Bookends is much more mature and supports more formats with more details.
I am a Free member 
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VectorDesigner
Token reviewed on 26 Jan 2008
It has a weakness on import/export formats. It only supports EPS import, no other formats.
But it is buggy..
Bookends
Token reviewed on 19 Apr 2006
Meditation Music
Token reviewed on 24 Mar 2006
Apart from that Its a really delicious application that I would consider to pay for, given a few enhancements. For now its unusable.