Does this laptop include the (hardware?) modifications required to protect from Intel Management Engine or not? That would be something novel that might justify the higher price.
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Until Purism has actually shipped a working alternative to the management engine firmware, their laptop is hardly any better than most commercial components. If you buy the laptop, you're purchasing hope.
You would be better off getting a Libreboot. http://minifree.org/product/libreboot-x200/