I don't think you are paying double for one app though are you? I'm a premium customer and I now have it on my phone, iPad and TV - all for one subscription. Considering how much I used to pay every month to buy albums, I have to say that Spotify Premium seems to me like one of the best bargains of my whole life!
Same here. Why paying double? I use Spotify on 3 computers, 1 tablet, 1 smartphone and now my tv with just one subscription. You can't listen to music at the same time on different devices, because this would allow to share a user account with other people.
But it still says my firmware isn't compatible? It's like its not even checking now, first time it said something like "Checking your firmware version, this can take a while", but now it just goes straight to "Firmware not supported". I tried reinstalling the app but no changes.