B+
Can't understand how so many in here are bashing the 5S? NFC is not going anywhere...give it a rest. Smartphones from here on out will only make incremental upgrades...there is just no more technology to squeeze into these devices at present.
Pros:
A7 is a beast. Just listen to iPhone 5 owners (myself included) talk about how fast/speedy their phone is. The A7 doubles this! How does this warrant a grade of "D"? 64-bit! We won't see the fruits of this until devs convert intensive apps, but at least it is...what's the word everyone loves to use....oh yeah, "future proof!"
M7. The possibilities are vast. Read Apple's website on just a few of the things iOS7 takes advantage of with this chip. Auto converts to walking turn-by-turn directions when it knows your walking....auto disables Wi-Fi alerts when driving...
Camera! If for any other reason, I love upgrading my iPhone every year just to get a better camera (note I didn't say the only reason). I take lots of pics, and the 5S camera capability is a HUGE improvement over the already impressive iPhone 5.
iOS 7 is built on a 64 bit kernal.
Free iWorks/iLife apps (of course, this is also a con since I already own them).
Touch ID. Although it is locked to 3rd party devs, this is an amazing tech to include in a smartphone. From all accounts, this works flawlessly in true Apple fashion...it just works! Next year, we will probably all pre-order the iPhone 6 using the Apple Store app and our finger!
Color options! This is a "tock" cycle update, but Apple didn't just upgrade the internals of the iPhone 5. They pushed themselves this year and expanded their product line up. My point, you have many more options for a new iPhone than you had during the 4S release cycle.
No gimicky features! Unlike Samsung and others, I'm actual happy when Apple doesn't release features that are not ready for prime-time.
Cons:
3 major announcements (A7, Camera, Touch ID). I get it...we all want the WOW announcement. But given the "tock" cycle...it is what it is.
No pre-orders for 5S! This is just ridiculous. No excuse Apple...some of us do not like standing in lines.
Storage remains unchanged. How many years until you give us 128GB? When I travel, it would be nice to have more movies on my iPhone.
Battery life! Seriously disappointed here. I was really hoping for a 2 or 3 hour battery jump with a more efficient processor. The iPhone 4 had a tremendous battery. It would be nice to get an iPhone that could match it some day...maybe the iPhone 6?