Installing Pandora was easy. Although initiating the install was weird (you have to hit a 'Free' button which then changes to an 'Install' button), overall, the process was simple.
One thing I really liked was being asked for my Pandora login to make the process easier. "Already a Pandora user?...even easier, just login...Pandora for the iPhone is fully integrated with Pandora on the Web". The application imported all of my stations quickly.
Using Pandora was just as easy. Although functionality is a bit limited when compared to the web version (for example, song, artist and album info isn't available), it works great as a 'walk up and use' application. Additionally, the 'look and feel' matches the iPhone well and the album cover art is prominent. Just like the website, it takes one click for you to listen to your stations.