I have fed numerous dog foods, but when my normal bag went to $47 for 37 lbs, I tried Pro Pac.  Pro Pac gets a great rating on dogfoodanalysis and at $28 & free shipping (not normally available in my area) I just couldn't refuse.  Everyone talks about corn being a cheap product - have they checked the grain markets the past few years?  My dogs do well on it & considering the price I don't feel like I'm "cheating" them.  I'm on my 2nd bag & ordered 4 from Amazon; so far they've retained their coat & tone.