Generally like having Spotify in my MS now with v10 - having access to my own playlists plus Daily Mix and Discover Weekly, as well as selection of other curated playlists seems to bring better music selection than Slacker. Not to mention ability to listen to whole albums etc. Oh and also I get to forget about all the long-standing nagging USB music player bugs for a while...
Main problem I’m having with Spotify on v10 is that it frequently hangs (eg at least once a day) - either get a Loading Error or simply get a forever spinning arrow icon. Usually can’t even select another Spotify playlist or song, just keeps spinning. Sometimes going out to Slacker and back to Spotify fixes it, though behaviour is inconsistent so I can’t say for sure there’s anything with that. Just frustrating it doesn’t simply work reliably without fussing with it (but then again, I’ve come to expect nothing else with Tesla’s music player)
have not had a problem like others have reported requiring me to re-login to my account. Also unlike others,I use my same Spotify account on my iPhone, iPad, a couple Macs and Sonos speaker, but have never had the car or any device complain my account is in use elsewhere