I went a couple years back, really fun/easy going event, cheap too! Also the livestock vendors that are local let you pick up when you're planning on leaving the area (think will call).
Last time I went I parlayed it with my cousin having just moved to San Diego (visit), never been to Disneyland when there was Halloween stuff up, found out I can't take jerky rollercoasters (Magic Mountain) fun super weekend. I would do it again if I thought I could (well minus the Disneyland bit... that place gets crowded as all hell on the weekends at this time!)