I've never really listened to much by The Rocket Summer...definitely impressed by his taste in music (Elliott Smith and Yeah Yeah Yeahs). I've listened to this three or four times now...I really like his voice. Will definitely be checking them out!
His music is much more poppy, but if you are ever in a bad mood he has a lot of songs that are fun and positive about life. He also has others about heartbreak, etc
I recommend songs like Do You Feel, Never Knew, and Goodbye Waves and Driveways.
Also....try to find a good sound quality video of the live version of So, In This Hour.