PC World is out with their new Microsoft Surface Book review. The review confirms that no other 13-inch Ultrabook laptop is faster. The Core i5 Surface Book gave PC World 821 minutes, or almost 13.6 hours of runtime. In the Surface Books, the base unit has a 51-Watt-hour capacity, with another 18 Watt hours of cell in the Clipboard. Head on over to PC World for the full review here.