I've had mine for a week. Very nice phone. Beautiful to touch and the screen is great, buttons are a bit too flush, but you get used to it. Battery life so / so. What you'd expect from a smart phone. I have locations, bluetooth, etc running and it lasts a full day. My only gripe so far are the apps. Some of them work beautifully and the live tiles are really neat. CNN, xbox integration, kindle, music, people hub, evernote, skype, office 2013 all work really great. But some of the games, apps etc haven't been updated for the larger screen so there's slight pixelation or letterboxing on some of them. The Facebook app for WP8 is TERRIBLE. So buggy. But the facebook integration with the actual phone is brilliant, so you don't really need it. Internet Explorer is an okay browser but I'd really like to see Chrome. Maps app works fine, great that you can download maps for offline use. No turn by turn yet unfortunately unless you get the Lumia 920.
One other consideration for me was that I've switched from iOS so anyone who was messaging me using iMessage is still sending messages to that device. I suppose I can switch off iMessage on all my devices (iMac, iPad, iPhone etc) but then I kind of like being able to message off my iPad sometimes. But that's an iOS thing really.
Something else that I'm really appreciating is that apps can have access to the lockscreen, so I can set Facebook to show off photos, or have CNN display a photo and a top news story, or have Bing update with a new wallpaper every day. Really nice.
So overall, great phone and OS. Still torn between this and my iPhone 4s.