One of mine is on Chappie (tinned) rather than an expensive prescription diet
as advised by my vet.
She has hypothyroidism, her levels of high cholesterol have stablised etc since being
on this diet. Her corneal lipidosis (which can be caused by hypo-t due to high levels of cholesterol)
has also shrunk in both eyes. So being on a cheap not so nice ingredient listed food has actually
helped her health. :)
The only problem I have is that she has got gum overgrowth (typically a common complaint for the breed she is)
which may or may not have been helped by her soft diet. We do give some crunchy low fat biscuits to help.
Oh and for it not having much protein..she's slightly podgy too

So although I may not be overly keen on the ingredients list, I can hand on heart say that it has
made a difference for my girl.