I must admit as an Apple device wielding individual that the Windows Phone UI has always intrigued me. I was put off however by a colleague who at the time of writing is on his 4th Lumina 920. I know that this is anecdotal, but the hassle the guy had getting faulty phones replaced was poor. Nokia weren't interested. Which is why I'll stick with Apple. My own experience of their customer service has been second to none, and ultimately it's a big decider for me. It is a lovely device though, when it works.
Having tested Window 8 Desktop with a view to deployment in the enterprise space, all I can say is that as things stand, not a chance. The metaphor just doesn't translate to the desktop.
As another anecdote: I had to get my 920 replaced, and it couldn't have been easier. I went into an AT&T store that specialized in device support, they looked at it for a few seconds, and immediately ordered a new one with free overnight priority shipping to my home.
Having tested Window 8 Desktop with a view to deployment in the enterprise space, all I can say is that as things stand, not a chance. The metaphor just doesn't translate to the desktop.