I haven't yet because I'm not willing to shell out $500 for a new box to run ONE game that I really don't have enough time to play.
I'll definitely play it some day. Probably when some friend is upgrading to the XBox Infinity and they give me their old XBox One and FO4 for free.
But I will still love it MADLY when I do get to play it. Building a city?!? In FALLOUT?!? That's the game for me. No doubt.