I listen to it all the time at work. I've created a few genre stations, and it rarely gives me stuff I don't like. I've discovered quite a few really good artists with it.
I go through a few weeks/months really getting into Pandora, then I get tired of the same songs they keep giving me. I then go back to my music collection for a few weeks/months. Repeat.
We are deeply, deeply sorry to say that due to licensing constraints, we can no longer allow access to Pandora for listeners located outside of the U.S. We will continue to work diligently to realize the vision of a truly global Pandora, but for the time being we are required to restrict its use. We are very sad to have to do this, but there is no other alternative.