Interesting. I've only used Pandora from my IPhone (they have a free "app") for generic background music, but for what it is, it mostly gets its tune selection right and the fact that I can plug my phone into something and have an endless music source is great. I am surprised sometimes, however, when I "create" a channel and the performer that I name it for is NOT in the first tune.
The sound isn't great, but I'm not expecting audiophile, just music from a period without interruption, which it does well.