A:AnswerIf you link your Pandora account to Alexa or IHeart radio station it will play your Pandora and create stations. It will play radio stations connected to IHeart.
A:AnswerThe sound is not bad for a small speaker. Of course it isn't going to sound like high quality stereo speakers, but it does a nice job and if the volume isn't turned too high it sounds better
A:AnswerWe use it to turn lights off and on, lock our doors, ask questions get weather reports in the morning while making kids lunches. You can to a lot with Alexa.
A:AnswerIf by updates you mean new skills and integrations, then yes, when you configure/enable skills with Alexa they are available on your other Alexa enabled devices.