I tried their Lamb and Millet food years ago with my GSD. (They only had two formulas at the time.) I liked it so much that I became a distributor. It was one of a precious few foods touting "human grade" ingredients at the time and I liked the fact that it was baked vs extruded. My GSD loved it and did fine on it. His poops were better on this than on other commercial foods, but we went back to raw after just a couple of months. Looking at the ingredient list now it seems a bit grain heavy and allergen heavy. The protein is on the lower end of acceptable. It's still a fine food and if your dog is doing well on it, I wouldn't suggest you run out and change it. If you are shopping for a new food there are better brands on the market now.
From personal experience my Toula did fine with it but my male Pete did not. I was only just starting to mix it in with their Kirklands and within days Pete got itchy spots and a bumpy scaly patch on his back which started clearing up as soon as I stopped adding it.
I have friends who have fed it to their Dobes for year--over 10 years for sure. They also liked it so much they became distributors because it enabled them to be sure of getting it. I don't know which of the products they feed but the only problem they've every had was that it didn't seem to have enough fat during the winter months to keep the the dogs coats in tiptop condition.
They added fish oil to it and have never had another problem.