I am looking forward to the integration aspect. I have multiple windows phones and surfaces and laptops and PCs and of course an XB1 in my home(and a M$ Band on my wrist). I would love for all of this tech to truly work together.
I have been running windows 10 on an old laptop and it runs very smooth. I haven't really seen much of the "integration" part, as the other devices I own don't have a test version showing it yet.
It is near the end of the end....







