I've worked at a pet nutrition store for a while, and have found that its not extremely popular because of the different protein sources. But it is a fabulous holistic food that really just doesn't sell because of the crummy packaging!
I hope everything works out on this food, if it doesn't, I would suggest Chicken Soup for the Dogs Soul. It comes in large breed/medium breed specific, adult senior puppy forms. Its a holistic food for WAY less. Both of my dogs are on it and they are doing so great!
Best of luck