I’ve used the old app and the new one. My first reaction was very negative. That’s because things had changed. Once I got past that I found the App more useful. I’m glad I have it. I wish it was better. Frankly I’m very disappointed they put crap for health in it. A simple fitness band does a better job.
I would encourage you to try it out. And be patient, as I wasn’t and it took me longer!
PHONAK had an app for my old copilot II with my old hearing aids. And then they deleted it. That was … (carefully biting my tongue.) So I don’t trust PHONAK to continue to support the product I buy with useful apps.