Hi , and welcome! I see you are a new member here, having joined yesterday in the morning. We are glad to see you already engaging with the community through this, your first post.
The Air Physio is one of a group of devices known as Positive Expiratory Pressure (PEP) adjuncts. This classification of products is designed to help patients with mucus clearance from their airways. In my experience taking care of patients, many find great benefit in using the PEP devices.
In the interest of addressing your concern, I thought you might gain some additional insight from this articles on that very topic: https://copd.net/clinical/flutter-valves-acapellas.
I am also hopeful others in the community will see your inquiry and respond by sharing their own personal experiences using this type of therapy.
Have a great weekend!
Leon (site moderator COPD.net)