@Jonathan has talked about them on the podcast before, and said that from their experience they are pretty darn close to the estimates that you’ll get from the online calculators or one of the scales that give you that kind of information. I have never had one done myself, but can definitely understand how it would aid in weight loss. If it’s reasonably priced I would say it’s good info to get started on a weight loss journey, but if its pricey I would do some more research before biting the bullet. Just my 0.02