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Pro Very thin and light
At just 389g, the Galaxy Tab S2 (9.7) weighs less than a pound, and is incredibly thin at just 5.6mm.
Pro Great performance
The Tab S2 has Samsung's own Exynos 5433 processor, which has 2 quad core processors inside (one high power, one low power). Only one processor set runs at once, however when performance isn't needed the low power set will kick in instead of the high power set saving battery.
In GeekBench 3, the Tab S2 scored 4175, which is shy of the iPad Air 2's 4547 score but solidifies it's position ahead of the Dell Venue 10 7000 (2900) and Microsoft Surface 3 (3531).
While not native to Andoid (yet - it's coming with Android N which is expected this fall), the Tab S2 supports for limited multitasking. You are limited to about 20 apps but Chrome, YouTube, and other applications are supported. Multitasking performance suffers a bit, but at least the option is there.
Pro Amazing screen
The high resolution 2048x1536 Amoled display provides very rich colors and a pixel density of 264PPI (it has the same sharpness as the retina iPads).
Con Lack of Android tablet apps
While Android has the largest app store, it lacks tablet-specific apps. Upscaled phone apps will still work, however not all of them rotate into landscape mode, and very few of them will make the most of the larger screens that tablets provide.
Con 4:3 screen ratio
4:3 is good for browsing the internet and using apps in portrait mode. If you want a tablet for media consumption this ratio will not help you because all video in landscape mode will have a 2 big ugly black bars (top and bottom).
For media consumption it is better to have a 16:9 ratio (which is rare on Android tablets) or a 16:10 ratio (common for Android tablets like the predecessor of Tab S2, Tab S).
As with all Samsung products, the Galaxy Tab S2 (9.7) comes pre-installed with a lot of stuff you'll never look at. You might want to uninstall what you can, and disable what you can't uninstall.
Con Average battery life
The Tab S2 scored 7h32m on LapTopMag's battery tests - above the Dell Venue 10 7000 (6h55m) but below the Microsoft Surface 3 (8h01m) and far behind the iPad Air 2 (9h20m).