Not so good
The camera screen only appear on 2/3 of the phone display and doesn’t rotate accordingly when shooting vertical, can’t even lock rotation at horizontal. The shutter and record button are too big also not transparent or can be hidden which is a huge waste on the phone screen. As I used Panasonic Image app before it can go full screen display on the phone, this is a huge downside even though it means to use for S series. The only upgrade from Image app is a touch AF button, otherwise I don’t see any other advantages.