Yes, I tried streaming SiriusXM (the Spa channel in particular) to my Dot. But at the time I used the free preview. I don't think it matters whether I was using the free preview or my own car subscription. But I found, to my chagrin, that I could not ask Alexa what song my Dot was playing like I can when streaming Amazon Music. My Echo Show doesn't show that information (like my car does) either. This negates the reason I listen to Spa, which is to discover new (or old) artists I have never heard of before, so I can buy more of their stuff. Artists get only pennies/stream/song, so I think I am helping them to make more music if I buy a download or a whole album.