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With the Xbox One launching eight years after the Xbox 360 you would expect that the engineering team that created the new next-gen console had plenty of time to tweak the final product to perfection



From Techradar:
And that's exactly what lead designer on the Xbox One, Carl Ledbetter claims to have done. In a feature about the designer on the Microsoft website Ledbetter explains that the design team worked through more than 75 console, 100 Kinect and 200 controller prototypes in the search to create the best next-gen games machine.

Previously we'd heard "a large number" of prototypes had been created, but this is the first time we've heard that number surpasses 75.
  Microsoft created over 75 Xbox One prototypes