THis phone came out yesterday and I picked it up on AT&T. I'm not going to do a full review as I've not spent enough time with it and you can find those elsewhere. I will say though that this may be the phone that puts Android back in my hands.
I will admit that Apple has me spoiled at this point, but what can I say, I just love metal and glass! This is the first phone that I've found where I like the hardware look and feel as much as my iPhone, although the HTC 8X came close with that soft touch material. It's not quite as well built as my iPhone, there is one small seam that can be seen but you really need a microscope to find it, I'm seriously nitpicking here and in practical real world terms it's every bit as good as my 5.
The screen is amazing, much better IMO than the AMOLED technology Samsung and others use. I think the blacks are still better on something like the Galaxy S3, but the colors are WAY too saturated and fake looking on that phone. Granted I'm not doing professional photo editing on a phone, but I'd still like my color balance to look at least remotely similar to reality. You really have to see this screen to believe how good it is. The stereo speakers are also surprisingly good, though I doubt I'll be using them much.
The OS is still going to take some getting used to, there are things I like better about it and there are things I like better about iOS. If you're already in Android land this seems like a no-brainer, if you're thinking of converting over it's definitely worth a look. I'm not sure yet if this will replace my iPhone as my daily driver, and I'll be keeping it either way, but it certainly has a great first impression.