How's the offline app support? My full library (30k items) is available on my phone (not in high res). There are a lot more concessions I'm sure.
Offline support is alright, though I haven't worried about this much. I think it doesn't do any local deletion, so whatever stays in your DCIM folder is still on device.
Do you have to ever open the app though? On iOS/Android?
In my case I would need it to run on the phones of my family members, and they probably will never open the app.