I've always enjoyed the Access series of travel books, in part for their seemingly unbiased recommendations, but also because they often include little out-of-the-way things you might not see on normal touristy routes. My wife and I have been to S.F. each of the past 3 years, and this book has been my handy traveling companion on each visit. It's well-designed and although it's 4 years old now, it hasn't really gone out of date yet.
I have the 5th edition, not the 9th, and I see they are up to at least 12. I love the access guides for up-to-date restaurant, etc. info by neighborhood, but I think I'd better get rid of 5e, and buy another if I am lucky enough to go again sometime!