My CDC is really lovely and to be comfortable with her was the quality I wanted most as weight has been a really touchy subject with me for a while. However, I think the other most important quality they have to offer is absolute 100% knowledge and education on what can be a sometimes complicated and fairly unconventional diet and I don't always feel like this is the case with mine. I need to see her once a week otherwise I would probably lose my way. She measures me and weighs me weekly (I don't do this myself) and even offered to give me 2 bin liners of her clothes she was getting rid of, she's such a star!! Also a professional attitude helps.