If you want to read more about Windows 8 before installing it or buying it, The Verge's Tom Warren writes a good detailed review that covers the basics, UI, App Store, Notifications, Desktop mode, and Windows 8 vs. RT.

Tom gave it 8.8 as you can see here:
Windows8Review.png

Read complete review here:

http://www.theverge.com/2012/10/23/3537710/windows-8-review