I do WW at Work, and my meetings are on Thursday mornings. I use most of my 35 points on the weekend, Fri/Sat/Sun, and sometimes Monday. I try to stay at my target points the two days leading up to weigh-in. I've been losing 1 - 4 lbs. per week, for six weeks so far. I did have a week where I gained 0.2, and on that week I used some of the 35 points everyday (and ended up going 7 over!).
I occasionally watch "The Biggest Loser," and one thing I remember hearing was something along the lines of to eat strict two days, moderate three, and indulge a little two days each week. I'm sure for everyone it's different, but I find if I use my flex points early in the week or in the middle I do better than if I spread them out over all 7 days.