I have used ShutterApp several times and I can summarize as follows:
- Image quality depends on the camera quality of your smartphone and on adequate lighting.
- A tripod is mandatory if you want to obtain decent quality images
- Image quality is fair and good for social media, smartphone screens
- You need a lot of patience as you will rely on the communication between you and the photographer to achieve the desired results.
- I recommend having a second communication path (Zoom, Whatsapp video, Facetime, etc) so you can see the photographer as the app only allows voice communication with the photographer.
To me is a good solution for remote shooting when the emphasis is made on composition, lighting and posing rather than image quality (i.e. prints)