And mostly strikingly is how open iOS 8 can be. There are lots of API opened, finally we are allowed to have their party keyboards, Apple is taking more idea from jailbreak community and other platform. Overall, iOS 8 is much better OS than several pervious version. Up until iOS 7, iOS is still steal and boring compare with competitors. With system-wide their party keyboard, bunch of open API, health API, more importantly widgets on notification sheets, extension allowing app to app communication, I feel more strongly iOS 8 finally is real decent OS that is actually modern and offer more customizability. With all the openness found on iOS 8, I believe Apple will continue going down this road. Maybe we will finally see ability to change default application and file browser. With that, iOS is even more usable.