Great for tablet and phone.
just **** for pc.
This.
I've used the preview and it brings nothing I want to the desktop.
The UI is less efficient, multiple monitor support is garbage, and configuring anything is different for the sake of being different.
Windows 7 will be the new Windows XP that businesses hold onto for as long as possible.
Windows 8 might make an OK gaming or home media operating system, but to get work done it is garbage.
edit:
the UI hasn't changed between customer preview and RTM. I can download RTM right now, as I've got a volume license agreement here at work.
Tablets and PCs have different interface requirements, and trying to make a tablet UI work on the desktop is simply going to end in a bunch of fail, unless the desktop is flat on your desk, and not a monitor with a vertical display at the normal "further than arms length" distance.