I purchased this device about a week ago, I've had Nexus 5 earlier and now I upgraded to this model. Google has improved a lot of things, here is a list: -
First and most important thing, battery problem has been solved. Now, u can use your phone by charging once in a day.
Camera is working properly even in low light also, this was a known issue in Nexus 5.
I'm impressed by the screen of Nexus 6p, its awesome. It is much clear, more dynamic colors.
Premium look stand this phone in competition of iPhone 6s.
Overall, I'm satisfied by this device, but price is some bit high. Well nexus devices are expensive product.
