Love Zotero, have been using it since I started out as a researcher. I've found the PDF view to have noticeably more lag than either preview or skim, but I can

Love Zotero, have been using it since I started out as a researcher. I've found the PDF view to have noticeably more lag than either preview or skim, but I can live with that for entire package (and can just open the papers in those readers).