It seems like they've added some questionable new UI things to iOS 10 on the 7s. The "lag" feeling when closing apps feels by design, the multitasking jump effect, etc.
Some I reallly like. The Taptic feedbacks in general I think are very cool (especially the clicking when you scroll a wheel to set your alarm, etc.). Others I remain unconvinced of. We'll see if 10.1 improves the experience.