Nvidia went a little outside of its comfort zone when it built the Shield, a portable gaming device based on essentially stock Android with an integrated hardware controller. I wasn’t sure what to make of it when it was announced: Was it a reference device for potential Tegra partners? Simply a showcase for what its mobile graphics processors can offer devs and device-makers? Or a true competitor to the 3DS and PS Vita, a genuine consumer product with true mass-market appeal?