- none of the eInk readers have enough resolution and PDF annotation support to really work properly for academic paper reading, annotations
- none of them have reference management
Now the tablets:
- ipad : iAnnotate is very good for PDF annotation. iPad walled garden anad management through it's own forced systems is very cumbersome (imho). It dictates your workflow, not the other way around. For ref management, Zotero and Mendeley are available. The screen is horrible for long term reading (imho, ymmv). Must use an anti-reflective screen protector
- Android tablets: same problems with screens. No reference management. Workflow is *MUCH* more flexible. Double the storage space (64GB internal + 64GB SDXC card).
- Amazon Fire HD+ / Nook HD +. Forked Android. You really have to hack these to make them work in any useful way. Other android limitations apply.
To me, there really aren't good enough reference management capable, academic paper reading (yes reading for hours, not just browsing for 20 minutes) and annotation tablets. iPad gets the closest, but it is horribly limited due to Apple and the screen really isn't very good for long-term reading, the reflections are just intolerable for me. Some are willing to live with this or get a semi-matte screen protectore.