IE works fine for me. People App opens and I get the Welcome to the People app screen. I have never used it so I haven't done anything other than open it. Feedback App looks like its working too, it opens and shows all the categories etc.
Photo backgrounds are working on both machines, but still don't allow individual selection in folder as before. Neither does lock screen.
In 8/8.1 it was meant to aggregate your contacts including your social media accts. as it was on phone as a one stop place for social media. With the new Facebook api's preventing this on phone now, it results in a pretty useless app when pretty soon contacts will be in the new universal Skype messaging app for phone calls and texts through all devices.