Saw Kings of Leon and Built to Spill here last night, and it was my first time coming to this venue, which happened to be 5 min away from my house and I didn't even know it. I'm from the bay area, so this outdoor amphitheater was almost identical to Shoreline Amphitheater back home in Mountain View. There are about three levels of seating with a lawn in the very back end (General Admission) and standing room in the front near the stage.
I didn't take into consideration the temperature difference back home and here, so standing in 100 degree weather for a concert isn't quite the same as the bay area when it's in the 70's. However the bands were amazing and the sound was great. Drinks and food are a bit pricey (beers run for about $10 a pint and specialty cocktails were about $15 but did come with a souvenir guitar cup which was cool). We got radio promo tickets for only $10 so it was well worth it, also because we moved from our $10 seats down to a lower level before the show started so we got an even better view =)
Oh, parking was free, which I didn't know so that was a very pleasant surprise! I don't know any large venue that offers free parking to concert goers. You can upgrade to VIP parking for $20 but it's a madhouse getting out, so I'm not sure you'd get herded out any faster.
I would definitely opt for an indoor venue with AC in this area, but for $10 and three awesome bands, free parking and all that, it was worth it to come here! I'm sure I would feel differently if I had to pay full price and tried to get the food/beer here.