I've been trying it for a while now and it runs well enough. To its credit Windows 8 seems like a capable tablet OS, and its interface makes it good for use on a second monitor.
However, I just can't stand it as a desktop OS. I could go on for ages about it, but the fact is you essentially have two choices in how to use it; you either try to avoid Metro and use everything in desktop mode, in which case you essentially have a version of Windows 7 that's more annoying to use than ever.
Otherwise you have to try to embrace the Metro future that Microsoft is forcing upon everyone, but the change between desktop and Metro is just too jarring; you're essentially switching between two different OSes, which ends up being more of a disruption than a complement to a normal workflow. I've been trying it for a while and it just doesn't get any easier, you just learn to live it, which isn't the same thing.
Really when it comes down to it I don't see why Windows 8 and Metro aren't just two separate entities, as the forced amalgamation just means that neither is as good as it should be. Besides which, it doesn't really make sense to bolt Metro onto the existing Windows system as it really is more of a separate entity, that would stand better if it had been able to shrug off all the bloat that Windows has accumulated, rather than trying to run on top of it. They're ultimately just two very different OSes forced into some kind of nonsensical hybrid, making the combination much more of an annoyance than a benefit.
So yeah; I think I'm going to be sticking with Windows 7, as whatever ludicrous price is required to upgrade to Windows 8 will not be worth it for a desktop machine.
The only things I really like are the improved performance (startup is very quick) and the image + gestures as a password, but for me usability comes first.
