I like it. I like it a lot. I think the implications are huge. Especially with the Fitness app giving you these goals of globally recommended fitness/caloric intake levels. It'll make it that much easier to become healthier.
It also looks nice. It's not ostentatious. It's not in your face. It is customizable. It is not shoehorning a mobile OS into 2" screen. It's not 270º when claiming to be 360º.
Now with HomeKit, HealthKit, and WatchKit, how soon...