Design
This is the best looking iPhone yet in my mind. First off the antenna lines on the rear of the phone are moved more to the top and bottom of the phone and blend in more than they did on the iPhone 6/6S. Even better, if you have the black or jet black versions, they dont really show up at all. Overall, it looks similar to the 6/6S, but feels like the final, evolved version of the design. The size feels great and overall, it is just a beautiful phone.
Camera
The rear camera is stronger than ever on the iPhone 7. It has an improved 12MP camera that takes excellent pictures. The regular version of the iPhone finally has OIS(optical image stabilization) just like its big brothers, the Plus series. The pictures it takes are clear, capture a great amount of light, and due to the OIS, rarely come out blurry. The camera loads lightning fast and is overall just a spectacular camera.
The front camera also took another bump up to 7MP. The combination of the improved resolution, consistent retina flash(front flash), and speed are excellent on the front camera. I still wish it had a wider field of vision, but other than that, I have no complaints about the front camera.
Display
The Retina display is the same as it has been since the iPhone 4. 326 pixels per inch is a good looking display. It certainly does not compete with some other phones and their higher resolution screens, but for now, the screen still gets the job done. I would like to see them improve this in the next installment, but it is still a pleasing screen to view at 4.7 inches.
The brightness is outstanding and it also drops very low too, which is a benefit if you are trying to read something in a dark room. According to Apple the brightness is better than ever, but I have not noticed any discernible difference in that area.
Audio
The audio is excellent. It finally has stereo speakers where sound comes out the bottom right speaker grill and the top speaker on the front of the screen. Having stereo speakers, along with a front facing one makes such a difference when listening to music or watching a video. It sounds great and just makes the listening experience so much more enjoyable. This is certainly one of the biggest improvement areas over last year. Also, in terms of the big headphone jack controversy, it does actually come with a lightning to 3.5mm converter, so you can still use headphones with it.
Battery
Battery life has improved over the 6S and SE. On daily use, I have gotten a couple more hours of use per day. I would still welcome faster charging options, but this is a nice step up from previous generations. It has increased to 1, 960 mAh battery which makes a difference.
Functionality
This is the pinnacle of the IOS software experience. The 2GB of RAM, the A10 processor, and the implementation of IOS 10 is great. Everything runs well and quickly. Also, the fact that the storage sizes have all doubled to 32GB, 128GB, and 256GB is fantastic, as 16GB is a very antiquated notion. Expandable storage would be welcome, but due to how IOS is more locked down and for monetary reasons, I understand why that wont most likely be a feature in the near future.