Great phone. Miles better than my iPhone 4S. Did I really use a 3.5" screen. No going back now!

Screen is superb. Viewing angles than rival the ipad 3 Construction is great. Really solid. I actually prefer the build and ergonomics to my iPhone 4S. Much more natural in the hand, though you will need two of them to operate it unless you have freakishly large hands. I'm 6'4" and I need two hands.
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The camera is a bit of a let down in Video mode. Choppy and low bit-rate. Still shots are great though and the HDR mode best the 4S in my opinion.

Support of apt-x lossless bluetooth streaming is also a boon. Using it with a Samsung HS3000 apt-x bluetooth headset/dongle with my Shure SE530's and the quality is indistinguishable from wired.

Great phone and I have a feeling it'll outdo the S3 too.