Been playing with my Ativ for a day now, it works great under "ipad" like conditions like web browsing and things like that. There is quite a bit of lag when doing something intensive, especially downloading stuff, pulling up big files, installing programs, etc. It's not a huge deal, but it's noticeable. Also the Ativ freezes and requires rebooting a lot, I believe it's been happening in Metro IE10 but I only started paying attention the last couple of times, it's frozen like this probably 4-5 times since I first started using it. Thankfully the reboots are very fast, easily under 30 seconds for a completely cold reboot.
Office was a bust. It has a trial of Office 10, but WTF a 2 year old program? They should have included Office 365 trial, if not a free copy IMO. Worse yet, I installed Office 365, opening word I had an image in my document, program kept freezing when I clicked on the image to manipulate it and I just gave up and force quit. Powerpoint crashed right when opening it, I didn't play with office much past that.
I'm still not sold on the Atom CPU, but I also don't want 3 hour battery life with the ivy bridge, I've just gotten to used to having all day battery life with my ipad and will never go back to laptop battery times. In all honesty do I really need to do anything super intensive on a 11.6" screen ?!?! As for form factor, it's not as easy to carry around as an ipad, but once you get down to work the size of it is pretty awesome.
I'm going to put in more intensive stuff today, PS elements, play with Office a bit more, etc.