If it wasn't for my hands-on experience at a MSFT booth the other day, I would probably making the same comments as a lot of the rest of you.
It was a 32GB version, so I guess it was running WinRT, but you would never know or care. It worked just like my friend's Windows 8 laptop she just bought. After using touch, mouse, and gestures all on one device (both on the laptop and Surface) I was surprised to come back to my Macbook Air feeling like I used to feel coming back to my old Dell after going to the Apple store to check out their latest machines - like something was missing from my machine. And I would consider myself more of an Apple fanboi than MSFT.
The only things that really keep me on the fence are Airplay, my questions about build quality, and my fear that Windows 8 will be like every other version of Windows in that it will be a little slow and not be quite as reliable as OSX. And I guess I'll add to that a little worry that Microsoft will just abandon it like they did the Zune (which could have been more competitive).
My impressions with it were very favorable, though. The little type pad took a little getting used to but it was better than touch typing on an iPad or Android device. It even had an touch pad where you point with a mouse and two-finger scroll. I found myself thinking of it as a full laptop a lot of time.
I also liked that it had a USB, HDMI, and expandable memory.