I suspect that they do better if they are not kept inside the warm house for too long. Tree metabolism slows down during the winter, and the tree will wake up if it is warm for too many days in a row. You don't want the tree to wake back up.
I keep some of my outdoor plants inside the house over the winter, but they are under grow lights. If you want to keep the tree inside for a long period of time, then it would do better with a grow light and then keep it inside until spring. Like if you always put up the tree the day after Thanksgiving and don't take it down until New Years. If you want it inside that long, I suggest that you treat it like a house plant.
I really like the concept of a live tree. If you have a good place to plant it after the holidays.