Hi,
I am missing a lot some kind of offline mode, so that I can access my data when offline, at least for reading. For me, it is weird to have lots of important data somewhere that cannot be reached sometimes (in a plane, on the street at a coffee shop, wherever).
Some competitors do it by means of a desktop app, but if it is read only there may be a way to do it using cache memory being accessed trhough a browser.
I encourage you to consider it seriously.
Thanks,
Germán