Conclusion: Windows 8.1 Update is geared towards pleasing mouse and keyboard users while simultaneously deepening integration with its touch-friendly interface.
Pros: Fastest startup of any Windows version. Better mouse and keyboard usability. Better integration of modern and "classic" Windows apps. Loads of included apps and utilities. Improved Mail app. Help for getting started. Better integration of tiled Start screen and desktop. Boot to desktop by default...
Cons: Dual nature may still confuse some. Windows app store lacks some big titles. Included apps (mail, music) not as slick as those of OS X Mavericks.
Summary: The X86 version of Microsoft's new OS for your PC, laptop/netbook and non-ARM tablet.
Pros: Finally plays nice with touch, Has its own style, Maintains desktop environment, Great performance even on old hardware
Cons: Needs touch to come into its own, The cohesion is broken when running older software, Its visual style won’t be for everyone, Doesn’t offer as good a desktop experience as Win7, Its multitude of ways to do things may confuse