I put the GM on my wife's and my iPhones. All the advertised features seem to work except being able to see each other's devices in Find My Phone app. I assume the app will need to be updated before this will work? I just logged into the iCloud.com beta site and it shows up there. As a side note, for some reason all that shows up in Find My Friends is her Apple ID email account. I can't associate it with an existing contact. I can add her name and a picture to it, but is seems like it is confined to Find My Friends and does not integrate with my contacts. On her phone, I show up normally with my name, pic, and it is linked to my contact entry on her phone. Also, she does have access to my iTunes Match music in case anyone wondered about that.