The UI seemed really good, I was really tempted. But I was ultimately thrown off by App support in general. Wasn't there a thing, that Apps often weren't equal to their Android and iOS counterparts?

I used a Windows Phone way back in high school, I think it was an Xperia, the build quality was great and the performance was smoother than my friends' Androids and iPhones. Too bad there wasn't a lot of apps, that was the only down side though.

I really miss that UI, live tiles were so nice. there's launchers on android that mimic it, but it's not the same.