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The Nexus 6P was a collaborative effort between Google and Huawei. Huawei crafted all the hardware, while Google was left full control over the software. This combination makes for the best of both worlds - hardware is done by a world-leading manufacturer, and software is handled by one of the world's best software companies.
SpecsUpdate
Pros
Pro Large, high end display
The Nexus 6P has a 5.7-inch Amoled screen that is comparable to other high end Android phablets. At a resolution of 2,560 x 1,440 it has a ppi of 518. The Amoled technology provides very punchy colors, and doesn't illuminate black pixels (unlike IPS panels) making dark colors look better.
Pro Great fingerprint sensor
Unlike most phones where the fingerprint sensor doubles a home button, the Nexus 6P has the sensor placed about 3/4 the way up the back of the phone, right where users already have their index finger when holding it. It is not a power button - only a fingerprint sensor, and its tucked away in a convenient-out-of-sight place.
It is always activated, and placing your fingerprint on it activates it without the need for a click.