Beats 1 is fantastic. I listen to Zane Lowe's show everyday. It's a pretty diverse mix of music so even if I don't like everything I always discover some new stuff I never would have otherwise. I listen to Josh Homme, Elton John, and deadmau5 on demand. Matt Wilkinson is also quite good. The key feature for me is that I can easily add the tracks to my library while listening. That makes it a great discovery tool as paired with the 'recently added' view in iTunes I end up listening to the tracks a lot for a week or two and dig into the artists more in my own time.