I assume you're talking about Papers? The main feature is that there's an iPad/Android app that syncs really cleanly. With Zotero, syncing reliably across mult

I assume you're talking about Papers? The main feature is that there's an iPad/Android app that syncs really cleanly. With Zotero, syncing reliably across multiple devices was always hit or miss for me. Saving a few papers throughout my day, going home and reading/annotating them on my iPad, and then going back to work and pulling up a paper from the previous day with its annotations intact is the dream workflow for consuming academic lit that has always just worked with Papers but always required a lot of effort with Zotero. Maybe this is more of a "me" problem than a Zotero problem, but if I can't configure Zotero to sync reliably then many academics won't be able to. There are some other neat features too. The built-in reader is good enough to not bother going with a third party. The handling of in-text references is better than any alternative (the actual reference is listed when hovering or clicking the reference number in text–a seemingly basic feature that lots of citation managers and PDF readers don't have that is essential for maintaining concentration). The handling of figures, metrics, and smart suggestion of related articles is also top-notch. I was sad to make the conversion from FOSS but haven't looked back yet. Hopefully this new Zotero release will make it possible to transition back–it looks like lots of killer features in Papers are offered by Zotero 6, which is great to see. As for the rights-holding thing, most journals give their authors the right to distribute their work for free upon request, and there are some other loopholes for getting papers afaik, so I don't think it would be worth the time or effort to go after people with a few sci-hubbed papers in their Papers account. I am afraid that DRM will make this much harder though, especially for papers that have been downloaded on a university network for later offline reading.