Yup it's crack once you get past the tiny learning curve with the new start menu.
Faster than Windows 7
Microsoft Security Essentials antivirus built-in
Boots up in like 10 seconds
ISO Mounting support (no need for apps Daemon Tools)
There's probably more but I'm feeling it so far. I think if you don't get used to/like the new Start menu than stick with Windows 7 because it's not changing. I've come to like it though so I don't see myself going back.
I had the

Whatever folks' beef with Windows 8, performance will not be one of them.