The Surface Book should offer another feature found in laptops: better performance. The keyboard unit can include a discrete NVIDIA GPU. That’s only usable when the tablet is docked, of course. The keyboard also includes an extra battery; the system as a whole can manage a 12 hour battery life, Microsoft says, but that’s only when using both batteries. The tablet itself has much less battery life.
Yikes, that keyboard attachment is hideous looking. Despite all that — the Surface remains a compelling product whose success is hampered by the lack of good touch-first applications.