It works great but only with the wireless dongle. It works poorly with Bluetooth, and doesn’t work at all with direct USB connection. My original question was hoping to see if I could quickly resolve direct USB connection with the headphones since that seems like it may be the easier to get a great connection.

I’m also on ArchLinux!

I recommend something like the app DavX if you want to sync your calendar to Nextcloud or something.

I use a Navidrome server and ProjectBlue app on my Android. I haven’t figured out how to download music for offline use by using my ProjectBlue app though.

OrganicMaps and CoMaps are also good similar options.