well, first time it was very impressive. but as time goes by, it shows a lot of bugs including draining battery life faster. one thing I don't understand is that installation process takes longer time. it is little bit better through itunes. but do it by iphone itself through wifi is taking hell of time. sometimes it looks like freezing. so here you can't ever do. even you see installing is not seemed to be processed, leave it along until finish. if you turn phone off. next time you try again? you will only see apple logo forever if you don't connect with itunes. when you hook up with itunes, it takes long time to recognize as well. today, when I reset, it shows no wifi. you can't even tap wifi button to connect. it is just grey out. reset again, it shows up. it is so weird.