Hello,
I've started using Qlik Sense mobile app (Android OS) several weeks ago and got to say that offline mode is a real killer-feature of QSM. The only discomfortable thing I faced with is a need to update manually offline cache of each Qlik app, which takes a significant time and taps for 5+ offline apps
There may be 2 solutions:
1. Big green button "Update all offline apps", which starts the appropriate process
2. Autoupdating option, which updates off-line cache in depend on the data upload date of online app