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From this Bike Radar review
http://www.bikeradar.com/road/gear/category/bikes/cyclo-cross/product/review-genesis-bikes-day-one-alfine-di2-14-48427/The functionality of Di2 with the eight-speed hub is hugely impressive: it instantaneously snicks between gears on the flat, and is far superior to a standard cable system, lacking that telltale lag you sometimes find with an internal system. In high torque situations the hub can offer a short grumble when switching, but it doesn’t disengage and pedalling is not affected so it never hinders progress.
What's the point of Di2 Alfine?