I just switched to one. The interface feels polished, in a way that I've never experienced on a smartphone before. I've used ios and android devices, and I always found them clumsy and icon-heavy; lots of looking at little pictures, when it's so much easier for me to read text.

All of the widgets "feel" better to me, too, than Android or ios.

I realize it's largely personal preference, but I hope windows phone sticks around. I'd hate to have to go back to one of the others some day.

Because it's got a nice, clean UI with interesting ideas?

It's not a bad platform, save for the lack of apps.