It would definitely be great in case a native ARM library would be provided officially by Spotify.. The underlying library used by QSpot is API-compatible with the offical one as well. Currently, the official libspotify does not support offline mode for the current plaforms, so it might be the same for an ARM version as well (offline mode is only implemented in the official Spotify clients, e.g., for desktop / mobile (iphone, android, symbian etc.).