I signed up for a premium account a few months after I got the car and haven't had any major issues using it over the last year. It seems to work just fine, including the ability to create custom playlists. I did run into an issue with the Tesla media player app defaulting back to the standard Tesla credentials after I accidentally logged out, but I haven't tried it again so I don't know if it happens every time (seems to be a new behaviour in v8).