Well, I'm on an older iPhone 5S. Just updated today. First hands-on experience with the new OS. Apps open quicker. Safari seems snappier (for real). Big ol' buttons on the Music app for easy scrubbing and volume control. Thank goodness. Can't make heads nor tails of the messaging app, though that's more a liveware issue than anything else. Pleasantly surprised and overall very happy. So... what do you guys think?