Yep, that's true. I had a bunch of issues with their 'native' OS X app though. Every now and then the embedded browser (I think that's what they do anyway) would go nuts and eat my whole CPU. Also, the streaming quality didn't sound that great. I regularly use Grooveshark, and the quality of the songs over there was much better.
All in all, I guess it might work for some people. It just didn't make the cut for me. For that matter, neither did Spotify or Pandora. I guess I'm just not the target audience for that kind of service in general.