I have Oticon OPN1s, and use the iPhone app with them. I do use the app to adjust my volume and change programs (speech in noise and general are the two I use regularly). Personally, I love being able to stream phone calls, podcasts, audiobooks, and music directly into my aids. I can hear better that way and find I really miss it when using programs on my computer that require me to listen through my computer audio. I had a few issues with battery life early on, but that turned out to be more an issue with Zpower rechargeable batteries than the streaming apps themselves. I don’t think they add value for everyone. Your audiologist should have questions about your lifestyle and needs that should help you assess if the app would be right for you!