Don't get me wrong, the abs workout is great, I'm just thinking you may want to focus on what will drop the weight faster.
Well, I do a lot of walking (as I don't have a car) so I figure that's helping...and this new thing will definitely help loose the weight too. Most of my weight is in the belly -- so I kind of am focusing. I'm no weight loss expert, but I'll see if this works.
Probably the best way to loose weight is to eat right and do cardio. Eating right isn't just about eating good food, its also about eating at the right times, how much you eat and the kinds of foods you eat. Some foods speed up your metabolism which is what you want to do to burn off the fat reserves.
Combining that with some good cardio (running/walking/basketball/whatever) and you will see a lot better results than doing ab crunches. Ab work will only help to tone the muscles underneath which is good, but not your intended goal.
It takes a bit of work to research the right foods to eat, but in the end it is worth it.