Razer's BlackWidow Ultimate is something of a novelty, if for no other reason than Razer builds it with keyswitches of its own design, where the rest...
Razer's switches blend the best aspects of Cherry Blues and Blacks-at least for gaming; Attractive; adjustable backlighting; Rugged braided cable
Razer's new keyswitches aren't very good for just typing; Indistinct; blurry icons for Caps Lock; Scroll Lock; etc