I haven't done it - I did Jenny Craig many years ago and was great while I was on it. But with young children around I was fixing two meals at every meal. And no one at work was on it - so going out to lunch was also a problem. I know celebrities swear by it - but then I am fairly sure they are provided everything in exchange for their testimonies.
When all is said and done - the most successful diet out there is Weight Watchers. I have no connection with any program - but in California Workers' Compensation system when an injured party's weight increases the effects of the injury the carrier/employer has to pay for a weight reduction program. So I did research quite a few because they all wanted the most expensive and I can honestly say not one worked. No one wanted to do Weight Watchers because that took effort on their part and no special food.