Sitting between road and cyclocross bikes, gravel bikes have a specific purpose.
Born of the desire to ride a mixed bag of rough yet flatter faster surfaces than a road bike could handle, with lower gearing plus a more upright and relaxed geometry than a cyclocross bike. Gravel grinders like longer rides, are not shy of climbing, and fit the kind of mixed bag of off-pavement situations we in abundance in Marin.
Think of it as a fast offroad endurance road bike and you're on the right track.
Prices are starting prices.