I agree, Endnote needs a better way to detect duplicates while importing. I import into a “temporary” library and then import that into my main library with discard duplicates on. Developers should be able to streamline this into the software itself!
Why didn’t I remember that when the survey came around? Need to put this in “suggestions” again? I know I suggested this in 2008 here: http://community.thomsonreuters.com/t5/EndNote-Product-Suggestions/copy-to-duplicate-handling/m-p/2796#M220