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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 Immersive audio experience
The speakers on the Nexus 6P are better than your average phone speakers. First off, there's two of them, and they're facing towards you. Because they are on different sides of the screen, in landscape they create a stereo affect (you can hear sounds start at the left and move towards the right). The clarity and volume are also better than most competitors.
Pro Clean software with fast updates
Nexus devices run 100% Google made software. Because it runs Stock Android software, it should get updates quickest, as well as monthly security patches. Google also promises at least 2 years of software updates (the timer on that started when it launched late 2015).
Stock Android isn't very feature-rich, but the design elements look beautiful (Material Design) and performance is snappy. When Android N launches later this year, it's expected to add multi-window support.
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 Good battery life
The Nexus 6P will last a full day for even heavy users. The battery drains by 25% when playing a 90 minute video at 100% brightness. Most people are reporting around 3.5-4 hours of screen on time in a typical day. We only have limited data from the new builds of Nougat, so this may yet change for the better or for worse.
Pro Good performance
The Nexus 6P comes with the Snapdragon 810 processor, which was the best SoC from 2015. It s a 64bit octa core processor that is clocked at 2.0GHz. It offers high end performance and should handle any app thrown at it. Early versions of the Snapdragon 810 has heating issues, but that isn't a considerable drawback on the Nexus 6P.
Cons
Con Poor use of screen estate
Because it has on screen navigation controls the usable area of the screen is not as great as its 5.7" size would suggest. Thus you don't get much benefit from the enormous size of the device, bearing in mind also that the top and bottom bezels are much larger than normal to accommodate the speakers.
Con New charging standard
Old micro USB cables will not work with this device, meaning if you lose or break your cable you will need to buy a new one instead of using an old cable you had lying around. If you need to top up your phone away from home, it will be much harder to find a suitable cable initially.
Con Android 7.0 kills battery life (for some Nexus 6p users)
The new Android 7.0 update results in the Android OS and Android System using a large percentage of the battery even when the phone is off. Not everyone is experiencing the issue but those that are may find some reprieve if they factory reset the device.