The iPhone 7, as you may have heard (you've certainly heard), has no headphone jack and it looks almost identical to the 2014 iPhone 6 and 2015 iPhone 6S. But there are still compelling reasons to consider an iPhone 7, even if you own last year's model.
The iPhone 7 is now fully water-resistant (it can take a shallow dunking).
The camera takes notably better photos, especially in low light, and adds the optical image stabilization feature previously restricted to the 5.5-inch Plus model.
The battery lasts longer -- probably a couple of hours or more a day, under normal usage. (We'll update this review after we test the battery in our lab.)
The processor is faster, although you might only notice the speed on some intensive games and the video and photo-editing apps.