Connecting to the app takes forever and frequently fails. It seems to clash with the Android device pairing somehow. It's not great. The only workaround I've found (if restarting the things by opening/closing the battery compartment doesn't work) is to remove the pairing and set them up again.
I also would prefer to set up the programs once and then switch them with physical buttons. I had my audiologist do something like that with my old pair. New audiologist now that doesn't seem as flexible, or maybe it's not possible.
The bad app experience is honestly a reason for me to look at other brands for my next pair.
I'd like to think that a bit of a learning curve is okay for something that's basically an extension of your body, but everything seems to be getting stevejobsified these days. (I'll be driving my 2006 Saab until my mechanic either retires or runs out of spare parts!)