You just supported his point. The best feature of Grooveshark is that it has a big library... because it's acquired illegally. I just listened to Drake's entire album thats coming out next week. Sweet, but totally illegal.

Rdio has a better interface, Spotify better social/apps, Pandora better radio. Grooveshark will die because it's only option is to eventually go legal, and then it loses it's only advantage.