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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 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.
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 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 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.
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 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.
Cons
Con Slippery
The phone feels a bit heavy in the hand, and is made of Gorilla Glass on one side and aluminum on the other. Without a case or skin, it can feel like the phone is constantly on the verge of slipping off certain surfaces like arms of couches or a smooth table.
Con Power button located poorly
The power button can be accidentally pressed very easily, as it's located about 2/3 the way up on the right side (just above the volume buttons).
Con Rear camera housing stands out
Figuratively and literally, the housing for the rear camera sticks out quite a bit from the rest of the devices slick housing. This makes for an unsightly look to the device as well as a slight ledge where the housing for the camera begins.
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.
Con Too easy to accidently press side-buttons
Without a phone case, it's too easy to accidentally trigger the side buttons.
Con Inconsistent camera
While this is the best camera ever on a Nexus device, that isn't saying much. All pictures come out darker than competitors, and the lack of OIS makes it use short exposure times in dark scenarios, further darkening pictures.
Con Can be bent by hands
If you apply sheer pressure at the right places using your hands, you may be able to break it in two (there are some Youtube videos attesting to this). It means it's more likely than other phones of breaking if you sit on it on a (hard) couch.
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.