I'm a compulsive reader of ride guides, and I find this one perfectly satisfactory. Route choices are well-chosen. Directions and maps are solid. The rides are ranked by difficulty, and the standards are high--when it says a ride is hard, it is. Drawbacks: no elevation totals or elevation profiles; only 40 rides total; almost all the rides fall in a wide east-west band from SF Bay to Tahoe. One bonus: "Northern California" is defined broadly, so you get a few rides as far south as Morro Bay! One hideous gaff: the ride in my home town, the Chico to Davis Challenge, has you riding the route backwards--if you do, you'll kill first yourself, then the author.