New Prius owner here (2005, black, Package 3, LOVE it!)

I live in the SF Bay Area, in the Mt. Diablo foothills. My driveway is fairly steep, so I use the "B" setting going down. I do it, but I'm not exactly sure if it has value on other downhill slopes. I know that it does an engine-braking sort of thing, but don't really understand it and how to use it most efficiently.

BTW, while others in the general Bay Area are waiting for ordered Prius', I went to the dealership in Antioch and drove off with one of several they had for sale on the lot