Apple’s new iPhone 6S Plus looks just like last year’s 6 Plus — but looks in this case are highly deceiving. While the 2014 model represented a major new step in design and performance, this year’s version, which arrived on Sept. 25, delivers changes to just about everything you can’t see.

Existing features of the 6S Plus (and its smaller sibling, the 6S) have been improved and there are even a few groundbreaking features thrown in for good measure.

Unlike the 2014 iPhone launch, when numerous issues — including an unstable iOS 8, a botched software update that killed cellular coverage for some iPhone 6 models, and, ugh, “Bendgate” — put a damper on things, this year’s rollout went smoothly. Apple reported that it sold over 13 million iPhones in the first weekend of retail sales; the iOS 9 update has been generally responsive and stable; and, only a few weeks after release, Apple asserted that over 50% of iPhone users had the latest version installed on their devices and that over 13 million phones were sold in the weekend following the launch.

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