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Looking at the Surface Pro 4 next to previous models, the most obvious generation-over-generation difference may be the keyboard cover. Though sold separately, it's still an integral part of the Surface ecosystem, and it's hard to imagine anyone would purchase a Surface Pro without stumping up the extra $129, £109 or AU$199 for the keyboard accessory. The new version makes a major change to the keyboard itself, dropping the wide-faced, tightly packed keys of the previous Type Covers, and replacing them with widely spaced, island-style keys that mimic the look and feel of practically every consumer laptop on sale today. In practical terms, it means typing has less of a learning curve, and I was typing accurately on the Surface Pro 4 keyboard right away. On previous versions there was always an adjustment period, and it never felt completely natural.