I'm currently running it on two i7 PCs (3770k & 2600k). While performance is very satisfying, it seems as though Windows will always be far less thought out than OS X.
Exhibit A:
Compare "Control Panel" and "System Preferences"
- Control Panel is a cluster****. Windows continues to be the ONLY desktop OS that refuses to clean up rather then continue to clutter system controls. I've run 3 different Linux flavors, who all rival OS X for system cleanliness. And now with Windows 8 its even worse with "modern UI settings" thrown into the mix.
Exhibit B:
Lack of integrated Software/Utilities in Windows compared to OS X.
We can say that due to Mac OS's past as the underdog, they have had to support a vast array of file extensions out of the box (pdf, doc, iso, etc..). However, Microsoft is embarrassingly behind in support and ability compared to what is included with 10.8 out of the box. Microsoft has a history of forcing users to seek outside software for everything from burning discs, viewing and editing popular document formats, compressing/uncompressing files, supporting various mainstream codecs, etc... It has not improved enough from XP to Win8. It's disturbing that I can't even view a .doc file in Windows 8 without having it display as jibberish (in wordpad). As of now I still have a list of software (mostly opensource) that I install on every new Windows machine just to accommodate all the necessary circumstances which OS X covers straight out of the box.
Windows in my opinion will never be a superior OS (which it could) until they take interface design seriously. I'm not talking about customization; I'm talking about solving problems of clutter.