I've gone for years. There were many years when it was a really good show with a lot of innovative and inspiring quilts. The last few years have been more vendors (including ring cleaners) than quilts, but I still go in hopes of seeing that one quilt that will truly inspire me.
If you are traveling to get to Southern California, I would suggest holding out for the show in Long Beach.
http://www.quilts.com/home/shows/vie...SummerFestival
It is at least four times the size, and the last 2 years it has had some international and professional quilts that were quite amazing.