I can report that I did not go over my allowance. I would have but I ended up purchasing and returning a few items. Thus the money never left my account, if not for a few days.
I have, however, channeled my lack of spending into buying gifts for others. I think I have spent easily twice as much on gifts for friends and family this year as I have any other year. So MoL, in addition to doing God's work by keeping me restrained, you also made a very merry Christmas for a lot of other people.
No way I will be able to do January. I'm going to use and abuse these after Xmas sales.