In my experience, and according to everyone I have talked to productivity suffers with Windows 8. If you like Windows 8 on a phone and tablet, I can understand that (I don't, but that is personal preference). But Windows 8 on a desktop is a horrid experience. You can't treat a 23" monitor and full keyboard / mouse like you treat a small mobile device like a 4"phone (with no keyboard / mouse) or a 10" tablet (that may have a keyboard). They are different, have different uses, and require different interfaces.
When I am on a desktop I don't want to have to move my hands from the keyboard to the mouse, let alone to a screen. Maybe if the screen were embedded in my desk (and I got rid of the keyboard and mouse) it would be ok. But Windows 8 on the desktop causes all kinds of productivity problems. Testing in one environment I consult for has definitively proved that.
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