We always have a real one, it'll probably go up the weekend before Xmas (ie the 15th/16th) as it irritates me no end to have it up too early. It also droops pretty quickly in the heat and starts getting smelly, so putting it up any earlier is just a no-no.
I've bought some new white lights this year, the coloured ones we've had for years are old-hat and we can't get replacement bulbs for them any more, so I think they'll be in the bin soon. Decorations will be the same as always, I like my old bits and pieces, with their memories.
3b in South Australia.