I had never heard of such a thing until I saw the phrase bandied about on Mumsnet. I didn't really know what it was all about but thought the name sounded quite sweet, if a little twee so, as a dyed-in-the-wool Christmas-aholic I decided to look it up. I was appalled at the idea
Basically he is some sneaky Big Brother who is going to spy on your kids and then grass them up to Father Christmas if they don't behave! I think that is sinister and horrible. And the way he is meant to keep moving around the house under the cover of darkness is just a bit sinister.
Hmm! Even if the idea had been mooted to me when DD was small I would not have wanted anything to do with it thank you very much.