The jet black model isn't worth the hype.
Yes, I know this model is shiny and pretty and you can use it as a mirror. But let’s face it: if you carry the phone without a case, you will probably drop it, scratch it, and most likely pay another $649 or $769 to buy a new one.
If you do decide to get this model, please get a case for it (even Apple says to!). However, even with a case on, the phone ended up getting scratched a bit as it traveled from work to home in my backpack. When I used it without a case, it also ended up with scratches or smudges that made the model more of a headache than something to enjoy.