Technically I like it very well until now I've never had a crash, and most programs are running very well. The Performance With Windows 8.1 still seems to me a little bit better than Windows 7 and Windows. 8
The security aspects were further expanded and more interlinked in the system. Microsoft takes the issue of security very seriously and now protects the system from attackers. An additional security suite by a third party but one should not do without.
The Internet gearing has also been enhanced in this release, it is now even more difficult to work without Microsoft account. The App Store works, for example, only with a Microsoft account. But this I do not see as a disadvantage, the unique identification facilitates synchronization with different devices. Here Microsoft has taken a lesson from the Apple strategy.
Furthermore, can be stored data and files in the Microsoft cloud and synchronize. In highly sensitive data might take some getting used but for grandmas apple pie recipe easy class.
A little unhappy I find the numerous system options are now looking elsewhere. This makes the system a bit complicated administration and the transition to a new system, this time a little more complicated than usual from its predecessors.
In summary, it is exactly what it should do an operating system and a little more, it offers the user a graphical interface to the computer's hardware and operating system does the job very well, and almost to the full satisfaction. From me, there are four stars for this version of Windows.