May I ask why?
I really wanted to like windows 8, I like when companies are bold and try something adventurous, but I just don't get it. For a desktop without a touch interface, it just feels wrong in my opinion. The only thing I preferred to windows 7 was the performance.
However, I really want to be convinced otherwise. I'm not a microsoft hater and I really want to 'get' why metro is better. At the moment though, I just don't see it.
The reason I went to OSX was the interface and because of the interface I found things quicker and easier.
What I didn't like was the fact that I had to pay for some apps that were free on Windows and I couldn't do that odd bit of gaming when I wanted to.
With what I saw of windows 8, I really liked the interface, it was new, fresh and modern (IMHO). It booted fast and the UI didn't feel sluggish. I like the idea of Metro and having my commonly used apps in one place. I liked the fact that you now have the option to hide the ribbon as I would rarely use anything from the menus and it addded clutter.
Thing I like most, which is actually in Windows 7 and possible to do in OSX and is in Ubunutu is the fact I can press the start key and start typing to find something, then press enter to open it......out of all the operating systems, Windows 8 has done this the best.
There are also other factors like better Silverlight integration (I use Netflix and will be using SkyGo) and better media center software (IMHO).
I also develop for Windows on the side, so not having to load up Parallels/boot camp is also a plus and there are also some other insignificant things like not having to have Caffeine for OSX.
I HIGHLY DOUBT I would ever use the browser in Metro.
I've bought a new IvyBridge 3770k setup for Windows 8, whereas my main machine was my Macbook Air.
EDIT: Just bought myself a Windows phone to see if I can use that instead of my 4s. After getting the 4s I realised the only things I actually do on my phone are emails, instant messaging, browsing and spotify....all of which are available for WP.