The terrain is beautiful, the location is great and the sites seem well kept, but when we arrived the site we had reserved was occupied, so we chose to set up camp up the hill and off the road (nice view but close enough to powerlines to hear electricity crackle). To Lori's credit she offered to ask the other campers to move, but since we arrived late in the day and it was already close to sunset (and we have a toddler) we chose to forego that option. I believe the booking and check-in cause some confusion since upon arrival you are asked to place an "occupied" sign on your site, which makes it seem like it's first come/ first serve. Maybe some sort of calendar with the site reservations posted at that check-in would clear things up. The site we had hoped to camp on was definitely the best one, site #3.
That being said, not sure if it was especially loud due to our chosen spot being higher up the hill and unprotected, but the sound of the freeway was very noticeable (and the freeway was visible). Same can be said for the powerlines that run through the property... probably not as loud from the actual numbered sites.
Otherwise this is a pleasant spot, and I would camp here again (with the caveat of arriving early enough to ensure I got the site I actually reserved). Beautiful rock formation visible from everywhere, nice woods throughout, woke up to turkey's gobbling nearby. Awesome Montaña de Oro park is a short drive away.