I did install the preview onto my computer and personally i really don't like it. I am assuming some updates will have to come but things i really don't like are having 2 desktops. The pic attached gives you an idea of what you log onto, the fish in the bottom left is also a clickable link to your second desktop
If you can understand what i am trying to explain basically you boot into windows and the screen you are on basically looks like an enlarged windows phone screen, with the buttons for apps, web browser, etc....no task bar.
When you hit the left side of the screen it brings up a start button to switch screens and you can go to a desktop view that looks similar to what you launch into with windows 7. The only thing i enjoyed was the recent items bar where you could go back to see what you recently clicked on, when hitting the left of the screen.
I thought the first windows needed some work, as when you added things in like a custom browser (Firefox) and wanted it to be there instead of windows explorer, it didn't bring in the icon correctly and looked ugly compared to the rest of the boxes there.
I really hated how when you log off, and attempt to log on you are given a lock screen, in which you need to swipe your mouse upward to "unlock" your computer to be able to log in, which to me is entirely useless...
Lastly, they are making the price of W8 so low because they expect to make a killing off the app store, and might i add, now paying yearly for Office 2012??? What's up with that?
And i will say stay with 7 unless you really feel like dealing with 8, I think i might wait for some qwerks to come out and then switch, but honestly i just find 8 a hassle to use and overall headache