I've been waiting on Pandora's Premium service, ever since they picked up Rdio. I loved Rdio and since it was sold I was forced to find another service, Which turned out to be iTunes music because of price and library.
Back to Pandora, It's premium service is what you would expect and feels exactly like Pandora but with on demand but at this point, I find it hard to suggest it to people because of its limitations. Currently, the premium service is only supported on mobile. Desktop and other devices will have to wait along with family plans.
The 60day trial is enticing and you should check it out if you're curious, however, I don't see it worth the cost just yet. Who knows maybe in two months it will be.