I've never had a problem using my Napster login.
The quality isn't quite up to Spotify's but the integration with Sooloos is perfect, albums can be added to my library and browsed just like any other. For �4.99 a month it's really a no brainier for Sooloos owners to experiment with new music.

Geoff

861v4-LPS, ID40, MC200, Roon, Tidal
DSP7000, DSP5200HC, DSP5000.3, Oracle Delphi IV, SME V, Dynavector DV17mk3.
Mac Mini(2010), Synology NAS/Plex Server
Schitt Lyr, Audeze LCD-2, Sennheiser HD800, Beyer Terminator v4.
Oppo BDP-93/Vanity93Lite, Sony PW-10, Grandview 100" screen