I've been playing around with iTunes radio and it's helped me to ditch the Pandora and Slacker apps (I haven't gotten rid of Spotify yet, though).
So far, I'm happy with the the programmed stations, as well as the artists that pop up on a particular artist station (e.g. Triumph, Pink Floyd, etc. show up on my Rush radio station).
I really only have one complaint about iTunes radio so far: I pay for iTunes Match and I am still limited in the number of skips. If I pay the premium on other services, I do not have a skip limit. Granted, I'm avoiding advertising by being a paid Match user, but I don't understand why Apple can't let me skip as much as I want to.
What features do you like or dislike about the new iTunes radio?