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Let me preface this by: I like Windows 7. A lot. In fact, I like it almost as much as I like OS X.
But, working peripherally in the computer field (pun only slightly intended), I have found that I need to keep up with whatever is new. When XP first came out, I kept reverting my own computer to the "Classic" theme, and it took me ages to figure out the new Control Panel layout, and the new Start menu layout. And inevitably when I was asked to help other people, they would be on this foreign, alien landscape - even though I was supposed to be the one to know at least a little bit about computers.
So this time, with Windows 8, I decided to take the plunge. I formatted my main computer, kicked everything off of it, and started with a fresh install of Windows 8, leaving nearly everything stock.
It wasn't as big a shock as you may have imagined. I had at least installed the Preview Release, and knew roughly what was going to hit when Modern UI loaded up. It was roughly akin to sticking your toe into an icy lake - yeah, you know it's cold, but it still doesn't prepare you for the shock that hits when you jump in all the way over your head.
I've only had a day to wrestle with it so far, and so far my head hasn't exploded. But I do have a headache.
Once I started to regard the Modern Start page as one huge, full screen Start menu, the computer at least became functional. Metro... err... Modern Apps look awful. They may be really nice on a tablet, but on a 24" monitor it's abysmal. Once you get back to the desktop, there is some measure of familiarity. The Taskbar now extends across all monitors (rather than just the primary), which takes a bit of getting used to after staring at the desktop there for years.
There are some bright spots. Startup time is fast - really fast. Most all programs have worked, and in many cases, Windows 7 drivers work for things that don't have Windows 8 specific drivers yet.
Do I recommend it? No. I don't. It's like a kludgey poor attempt to bridge tablets and desktop computers. But if your installing a new computer, or buying a new computer with it pre-installed, I wouldn't immediately jump on the "downgrade" option (like was the case with XP->Vista). It takes some adjustments, and it's not all roses, but love it or hate it, this is the way the wind is blowing.
Also, Start8 is looking really really tempting.