Once I could start having bars I've tended to have around 3 or 4 a week and have found my weightloss has stayed around an average of 3lbs per week.
As for the mousse's I absolutely luv em ~ so have one everyday. Even been known to make up a jelly and have that as well as a mousse and yet still have maintained a 3lbs average weight loss.
I'm nearing my goal weight now, so moving up the plans and if anything it seems that has slowed my weight loss, not the bars or mousses. ~ but as has been said, we are all different, so give them a go and see how you get on. It is nice to have something different from shakes after a while.