We haven't done it in CA, but have for Hawaii. We've had good luck and plan on using them again for car rentals. We got a premium car for less then we were quoted anywhere for a compact. And when we got there they said they didn't have a set category for premium and we were given a choice of any car they had on the lot. I know most would have gone with the convertible with it being Hawaii, but we chose a Subaru 4wd and liked it so much we bought one when we were back home.