I haven't tried it and I won't. It's just a gimmick, like Full Bars. It's not the answer to losing weight and getting healthy. I doubt that they work but, even if they did, you can do a lot better than a bar just by working on your meal planning and finding healthful foods that you enjoy and which fill you up and leave you feeling satisfied until your next meal. You don't need a bar to do that, just a little time to work on your meal planning and, if you put in the time for that, your efforts will pay off for a lifetime (and you'll know what to eat from now so that you feel satisfied).
Even if the bars did work, are you going to eat them for a lifetime? Because if you only ate them until you lost weight, you would gain the weight back once you stopped eating them and no longer felt full/satisfied and started eating more calories again.
Once you lose weight, you can't go back to your old ways or you'll just regain it. You'll also end up having to eat less calories to maintain a lower weight than you need to eat now, to maintain a higher weight. If you're hungry now, on more calories, you'll be even more hungry if you lose weight and need to eat less calories to maintain that weight. So, I would forget the bars and work on meal planning. That's the key to healthy weight loss that you can maintain for a lifetime.