It's looking good. I like that there's more variety in start screen backgrounds now. Other than that, not a whole lot of difference to the RP. The Xbox Live app now works (although it has none of the Xbox Smartglass branding it apparently has in the US). The mail app is less confusing when using multiple accounts and supports IMAP accounts now, but unfortunately, the Messages app still only allows you to use the Microsoft account you signed in with, which means it's unusable for me.
I like the fact that Window borders now use the dominant desktop background color, by the way. I was confused by the bettafish at first, but then I realised it must've synced my stuff over from the RP.