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Bookends versatile and easy to use.
I went over to Bookends after frustration with bugs in Endnote. Never regretted it. Versatility comes from the ability to create or adapt reference styles, add new types of source (e.g. conferences), search and import references, and organize references into groups and subgroups. And all these things were (relatively) easy to learn. Learning to adapt import filters was harder. I am sure that the fault was mine because the manual is clearly written.The only thing that does not work (in my experience) is getting the bibliography output in consistent format if I have cut and paste a reference - needless to say it is consistent if I have typed in the reference directly or imported it from a file or using Bookends facility to import from databases accessed by the internet.
Pros: Can import references. Easy to adapt reference styles and sources. Good value for money compared to competition.