I must hasten to add--Medifast doesn't allow dairy, strictly speaking. But, I can't use the Medifast foods except maybe once a day, so I've had to improvise. (I have a sensitivity to the protein isolates.)
I don't think Wonder Slim is comparable to Medifast, but to each their own. Maybe compare the nutrition profile of two comparable foods (bars or shakes) and see what the differences are.
"My religion is kindness." --His Holiness the Dalai Lama