It's nothing amazing compared to how well Spotify works, but it's nice to have radio integration in iTunes. I've been using it on Apple TV too, and the experience is more or less the same. Suggested songs aren't that great. There seems to be a limitation as to what music it rotates trough... sometimes I get the same 10 songs back to back, over and over. It's also funny to hear "placeholder" music (possibly left over from early testing.) It's too early to say how this will turn out, but it'll catch on better than iTunes Ping I'd bet. 😉