I'm running it - virtualized, so far - on both desktop and notebook computers in my own spare time, and I am not looking forward to seeing this one out in the wild.
Not a fan.
As with the latest offering of Microsoft Office, it seems to do some things right, and others are just so in your face wrong they need to be hacked/fixed/worked around to be of any use, and that's not the way I want to roll on my personal machines, let alone on a corporate scale.
The 'social' features of Office have been the bane of our productivity, as the functionality they offer is obviously aimed at the whole 'social' bit that, in the end, wasn't worth the hassle, the slow-downs, the confusion or the fact it clearly clashes with, say, imposed non-usage of 'social' networks on office infrastructure.
Same with the Metro UI - it's mind-numbingly inefficient, confusing and obsolete from the get-go. Sure, I can make it work for me in some ways, but that actually requires WORK, as in time and attention put into it. It's pretty much fine if I am free to tinker around with it in my own free time, but when it comes to keeping productivity high, as in not confusing your average end user, it's pretty nasty.
We haven't been able to assess the secure boot 'feature' yet, but as with Me and Vista, Windows 8 should be gladly passed around here. Don't get me wrong - some of the new and improved features really are nice, but the absence of the start button really is a nasty one.
Windows 7 offers high reliability with an almost perfect user experience, the subtle new UI tricks it brought with it such as Aero Snap are so cool that, really, everything 'just works'. Under the hood, Windows 7 is a beast on a strong leash. Windows 8 looks a bit like the rose-tinted poofed up poodle in direct comparison, despite the 'flat' UI.
Never change a smoothly running OS has never been so true since XP, so Windows 8 can - in my personal and professional opinion - pretty much throw its Metro in other people's faces, I am very happy with Windows 7 as is. To me, it's not a good sign that Microsoft is seemingly craving the self-imposed totalitarian power Apple holds with its locked-down idiocy, where users aren't even free to update their Java if they find themselves so inclined.
Invoking the Metro interface on non-touch interfaces, such as 99.9% of the productive devices in use, is a huge no-no. Not even the visually-focused graphics folks would want to waste one Wacom nib on Metro, and while a lot of us are looking forward to an Aero- and Glass-less UI experience, it's all pretty much nulled by the idiocy that is Metro. If Metro was standard for touchy-feely fondleslabs, hey, you got yourself a winner! Training the mouse- and trackpad-using consumerist sheeple with an enforced shift in paradigms is, quite honestly, offensive.