Lay My Hat

You do of course need broadband for the streaming services.

So what they're saying is that the system requires a router and a broadband (or at least 'internet') connection to function to its greatest potential, but that the absence of internet (beyond set up which seems to require apps to be downloaded) will not prevent the streaming from other devices carrying stored music?

Yes, that's correct.

Okay! So Sonos or Bose then Sonos are still the market leaders I believe.