Pro Natural location 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.
Pro Very good 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 speakers
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 (which makes sense when you think about it). 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 Quick software 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.
Con Charging port isn't backwards compatible
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.