I grew up hunting
the wild version (Caribou) in Alaska and sleeping on the hides, which are covered in hollow fur and thus intensely insulating when placed between your sleeping bag and the frozen ground. The meat is absolutely the best meat I've ever eaten.
I'm told the domesticated ones are slightly less frisky, but the Alaskan
natives who herd them in Northwest Alaska do it on four-wheelers at high speed and have
enough open-range tundra that they can mostly leave them alone. The antlers are truly impressive when they are head-down and charging you; think Texas Longhorn only worse because the antlers spread out further and they can tine you to death from many different angles with one shake of the head. (Bad hunting trip memories, close calls, dammit Dad next time sight in the rifle first!)
Although they will eat grass, they are heavy browsers of tree limbs and tips; that could be good or bad depending on your pasture situation.