For the specs its a very fast phone, and I haven't had any app hangups, or many crashes. The one app I use that sorta brings the system slow down is IE which I find pretty ironic. I would install chrome on this phone in an instant if it were as good as on windows. I think when 8 is released MS will be in a better position honestly, and things will get more streamlined.
I hope to see a high resolution tablet running windows 8 this smooth that can actually compete with Apple's insane iPad 3 specs of 2048x1536!
Its up to MS getting OEM's to make it happen.