I would never feed Purina. I don't like that it has corn as it's first ingredient, and I don't like the use of "by products". Chicken feet doesn't bother me, but feeding my dog diseased animal parts sure does!
My baby is extremely spoiled though, I have to admit. When I first picked her up from the breeder, she was on Science Diet. I promptly switched her to "Go Natural" grain free (kibble), and now she's on raw (Nature's Variety working our way up to Prey Model feeding) and lovin' it! So I won't even feed any kibble anymore, let alone Purina.
