I just used an N8.

My pocket review: absolutely not ready for prime-time - number pad shrank and grew a couple of pixels every time I touched it during a call, with associated delay for the redraw.

The hardware seemed ok (although I'm no fan of their design language now, and yet their first WinPhones will have the same?), the display crisp and the telephone functionality was entirely fine.

But the clunky software, as well as the user interface just reeked of something rushed out by amateurs in the mid 1990s. Competitive? Nope.

As a current Android user, I await with interest what WinPhone can offer. Nokia's homebrew? Not so much.