When Microsoft announced the Surface RT, it seemed clear that the ARM-based product -- with its precious adornments such as the kickstand and, of course, typing covers -- sought to appeal to those wanting to do more than is typically done with tablets. Microsoft, straight-faced, calls the Surface RT a PC, but with a connotation that it is trying to transform. There's less ambiguity around the Surface Pro. It has a capable Intel processor and runs virtually any Windows app. While someone from an earlier time might not recognize it as a PC turned off (especially with a closed Touch Cover), booting it up into Outlook would provide a convincing case.
In the story of the blind men and the elephant, the protagonists each discover some element of the majestic animal and draw conclusions about its nature without understanding the bigger (literally, in that case) picture. Now that we know the size of the Surface Pro's elephant in terms of how much it might feed from our wallets, its relative value and competitiveness will vary greatly depending upon which assumptions prospective buyers have when considering the product.