I showed up for the second half of the day to see all of the main stage band (Atlas Genius, Silversun Pickups, AWOLNation, Bush, and Yeah Yeah Yeahs). Fantastic show from all of the bands and you couldn't beat the ticket prices. Seeing Bush perform was definitely the highlight for me, although I realized I'm starting to show my age when it comes to music choices :-D AWOLNation seemed to be the overall crowd favorite and they put on a great show.
The sound seemed a bit off during the Yeah, Yeah, Yeahs set. The lead singer's voice was getting drowned out by the rest of the instruments.
I was also impressed by everyone that came to the show. The crowd near me was watching the bands and not being loud, obnoxious, or drunkenly stupid. Made a great show that much better.