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Pro Super high resolution display
2560x1800 is the resolution, and it works out to 308PPI (pixels per inch). Text will look super crisp, and you'll barely be able to see individual pixels even if it's an inch away from your face.
Pro Optional keyboard accessory
The keyboard can also act as a tablet stand, and doubles as a screen protector when not in use. It connects through bluetooth, and attaches to the tablet via magnets. When you aren't using it, just place it on the screen (keys facing in) and magnets will hold it in place, protecting the tablet's screen. While it's closed like this, the tablet will wirelessly charge the keyboard, meaning you don't ever have to worry about the keyboard's battery (it should last up to 3 months even if you never let it charge). It's a bit pricey at $150 extra on top of the tablet, but it's an option you have.
Pro Clean, quickly updated software
Pixel C runs software made entirely by Google - known as Stock Android. This software performs quick, and doesn't include any bloatware. It is also promised to be one of the first to get Android N this fall, as well as the next release next year (and very likely one more major update before support ends).
Pro Future-ready charging port
USB Type C is the new charging/data transfer standard that has just begun rolling out in 2015. It offers faster data transfer speeds, and a reversible port as well as a more durable connector. It should stick around for the next 5-10 years.
Pro Amazing battery life
For web browsing, you can expect the Pixel C to last longer than 13 hours. Local media playback will last 13h30m, and during a stress test it managed to last 5 hours. All of these results place the Pixel C at the top of the battery life charts.
Con New charging port
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 Some performance issues
Despite having a very powerful Tegra X1 processor, the Pixel C can studder and suffers from occasional slowdowns. These issues can probably be solved in future software updates, but are still cons for now.
Con Lack of utility software (for now...)
Most tablets have a version of split-screen: a feature which lets you have two apps open at the same time. The Pixel C doesn't have this yet, but it is included in the Android version N developer preview which is expected to release late 2016.