My experience is with the iOS version; I can't comment on the Android version but assume it is similar.
The app works, but the UI is awkward and slow:
- The app seems to query the Switch-Pros and refresh after every step.
- Menu organization is non-intuitive.
- Programming switch options involves stepping through sequential screens using "next" buttons until reaching the desired page.
Nevertheless, it works and is easier than programming the unit using the switch panel buttons.
Once the switches are programmed, using the app to activate and deactivate connected loads is easy and trouble-free.
I haven't had any trouble with Bluetooth connections. The range is limited, but it works fine from within or nearby the vehicle.