For one thing, this kind of high-speed innovation seems to require a near-addiction to a rapid flow of data that everyone can agree on, with a good feedback loop to test ideas.

FORBES: Google's Innovation -And Everyone's?

In my harsh tablet battery test, where I play a constant loop of video with the screen set to 75 % brightness and Wi-Fi on to retrieve email in the background, I got almost exactly five hours, which is Asus's official battery life estimate.

WSJ: A PC and Tablet 'Brick' for the Price of One

On our standard Windows battery rundown test, in which we fix the display brightness and loop a video endlessly to exhaustion, the Surface Pro scored just three hours and 46 minutes, despite having a 42.5Wh battery a third larger than the 31.5Wh pack in the Surface RT.

FORBES: Links 6 Feb: Microsoft's Surface Pro Reviews. Not So Good Actually