Wow, I'm amazed how mature this subject has been kept, it always raises a lot of tempers on other websites. Personally I feed a Prey model raw diet, it works for my 2 and is much cheaper than buying comercial food, but if you have a dog thriving on a certain brand of food then you should not feel any different if you are feeding $14 a bag or $140 a bag. My issue is when a company cheapens a food they do not pass on the savings or lie on the label. Costco is a premium brand food in a different bag, Blue charge 250% more!!!!! A meat sorce for the first ingredient will be 60% water unless it says 'meal', by-product is just that, splitting the grains is just another way of saying sweepings off the floor. That said I don't have to do well on it, the dogs do. And only the owners will be the judge of what works. 
! thing I have wondered, some mention feeding dog food to poorly chickens, nearly all dog food contains some form of chicken (even if they don't put it in the label) this chicken is usually from less than desirable places (google ' 4 d's of pet food') this protein has been processed and then packaged and then it can be fed to poorly chickens, Just out interest how did BSC come about?. 
It just has me thinking we should avoid that avenue if possible.
normal service resumed, happy paw times for all your furbabies.