We use to feed Purina. It's one of the better cheap dog foods. When the recall was going on a couple years ago a couple of our dogs came down with mild cases of salmonella. We switched over to Bill Jac because it wasn't on any of the recall list. We're feeding Simply Nourish (Petsmart brand) now which is about $48 for a 30lb bag.
Kirklands is good, so is Nutro, Science Diet is overrated.
I've noticed we don't have to feed as much with the higher end dog food because there's less fillers. I've also noticed there is less waste in the yard to clean up.