Let me start by saying I've gotten every new iPhone that's come out since the 3G, without fail, at either launch or pre-order. So I did the same for the 6, and after two days of using it I've decided to return it. The reason for this is one-handed use. I love being able to hold and manipulate my phone in one hand, and for me the 5S fits comfortably in the sweet spot. With the 6, my hand feels over-extended ever so slightly, and I have large hands so that's saying a lot. Also, when I'm lying down and reading the phone between my hands, the 6 puts pressure on the inside of my palms in a way that the 5S did not. Finally my thumb getting to the top of the screen requires extra extension. This might seem like a minor thing but with a lot of daily use, it adds up. I tried the double-tap thing but those taps also add up! So after a weekend of use, I've asked myself: is it worth it? The answer is no. I think I'm going to miss the potential NFC the most. And the rounded edges feel very sexy. But battery life is only slightly better, I still can't get through a day with one charge (I'm a heavy user). The extra screen real estate is nice but not at the expense of one-hand use. I always have my iPad if I want to do something that requires a bigger screen. So for the first time in my iPhone obsession, I'm forfeiting an upgrade, returning the 6, and praying that next year Apple will improve the guts of the 5S without increasing its size.