Tried Zotero. Yes, it imported everything from EndNote, including my PDFs, just fine. However, it can’t do a search of PubMed, which is something I need all the time. Also can’t find full text PDFs and download them so that’s also a nonstarter. But the lack of a PubMed search feature is the main issue for me at least. If I didn’t need that, then Zotero would likely fit the bill nicely.