Does anyone buy Flint River foods?

I get the Whole Dog journal and am looking at different foods they recommend as nutritious.
Shortly Stormy and Maggie will be off of puppy food and I want to find a good adult food for them.
My older dogs are eating senior food from Fosters and Smith and Corkie is on the prescription diet.
I am also going to put Lucy on this Flint River food.
I was just wondering if anyone here uses it and can give and first hand experiences on it.
I am trying to stay away from anything that has preservatives in it.