I played Diablo Grande - Legends in the springtime about four years ago. I thought it was very good but not great. The development is tucked into the western edge of the Central Valley, nestled against distinctive, oak dotted foothills. A very beautiful and remote place that would be very warm in the summertime.
Although this development is not terribly far from San Jose and the East Bay cities, it was quite difficult to get there, as there is no direct route there. You had to take highway 580 out to interstate 5 south for 45-60 minutes, then drive 5 or 10 miles west. My guess is a 2.5 - 3 hour drive from San Jose.
My interest in playing the course was based on the Legends' course high rating in Golf Digest at the time, perhaps 25th in the state, or something like that. I don't remember much about the course, just the beautiful oak dotted foothills of central California.