Salesman and people who did installation were quite professional
I have and would highly recommend Diablo Solar Services to anyone who asks about solar companies. They installed some solar panels on the roof, as part of a City of Benicia program offering credits to the first 30 people who signed up. We went ahead and did it, and it has worked out quite well. It was a win-win situation.
Diablo Solar laid out the costs and predicted the the solar panels will pay for themselves in eight years. We learned that solar can generate up to 80% of power each year -- providing full power in summer and about 30% of power during wintertime.