If you have a 5S instead, I’m more hesitant to recommend you run right out and upgrade. On the one hand, the SE is still faster, still newer, still a better camera, is still likely to get updates for longer and support more features introduced in those updates. But if you were going to draw a line in the sand between “old” iDevices and recognizably modern ones, the 5S is still firmly on the “modern” side, especially now that Apple has made it clear that 4-inch screens are sticking around. It has a 64-bit SoC and the Metal graphics API, it has TouchID, and its camera is still decent—the iPhone 6 and 6S were both built on the foundation laid by the 5S. The older phone is still pretty fast