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They're better than the original Surface RT and Surface Pro, to be sure. But they're not likely to fare much better, as the competition has gotten better, too. The Surface 2 faces the same problem as the Surface RT: Windows RT, and hence, not much software available. The target audience seems to be people who want to run Microsoft Office on a tablet, but don't want to run much else. They'll probably all buy a Surface 2, which means that it will sell about as well as the original Surface RT.
Meanwhile, the original Surface Pro faced the dilemma that there weren't any viable x86 tablet chips available. Today, there are two: AMD Temash and Intel Bay Trail Atom. So naturally, Microsoft chose neither, going instead with a 15 W Haswell chip. A 15 W chip in a tablet is a bad idea for a variety of reasons, and the $900 price tag without the touch cover that is half the point of the tablet dooms the Surface Pro 2 to sell about as well as the original Surface Pro. At least it will have lower idle power consumption, and hence longer battery life.