Here is a fair and mostly complimentary review from PC World
Through every iteration, Microsoft’s Surface Pro tablet has edged closer to becoming a true laptop replacement. Microsoft’s latest Surface Pro 3 takes several small steps in that direction—along with one giant, game-changing leap. Sure, you’ll still need to make a few compromises, but Surface Pro 3 can legitimately cover your notebook and tablet needs in a single package.
You’ll immediately notice the larger display. The Surface Pro 2’s display measures 10.6 inches diagonally and has a resolution of 1920x1080 pixels. Microsoft kicked up everything in the Surface Pro 3: The display is 38 percent bigger at 12 inches in diagonal width, and its 2160x1440-pixel resolution is breathtakingly crisp. Just as importantly, Microsoft’s shift to a 3:2 aspect ratio for the Surface Pro 3 adds 1.12 inches of vertical real estate to what already is a wider tablet. The result is a more luxurious, productive work space—and that’s key when you’re multitasking in a desktop environment.
There are numerous other upgrades behind the scenes. Though physically larger in terms of screen dimensions, Microsoft trimmed 0.24 pounds and 0.23 inches of width from the Surface Pro 2 to create the new tablet. Yet there’s still a full range of Core processors in the Surface lineup, including a Core i7 that somehow manages to live harmoniously in a 0.3-inch form factor.
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Microsoft Surface Pro 3 review: A legitimate work PC in tablet clothing | PCWorld