I can live stream using two iPhones and an iPad. The app is stable and easy to use.

I use the iPad in director mode, but I think using the iPhone in director mode is a bit narrow and difficult to operate.
The quality of the iPad camera is not fine, but I can also use the in-camera to show myself in director mode.

I found this easier and better than using expensive switching equipment.

On rare occasions the connection does not work and I have to restart the app.

Switching the app will lose the connection, so I need to make sure not making calls or anything else during live.

I find it easier to use than PC based services, but the main problem is that the connection is lost when switching between apps.