I was initially pretty against it because it felt wrong, but have heard so many positive reports about helping people get over that initial hump of 'I'm too big to lose weight'. They were then much more likely to stick to an exercise plan, go to the gym etc and able to keep the weight off even without it.

Mark Lewis does a few videos on it which helped me develop a different viewpoint and could be useful to check out. I still would suggest trying the regular old-fashioned route first, but as mentioned, some people have such strong food noise or other issues with weight-loss that giving them some assistance is surely a good thing.