We always buy the largest size bag of Purina One lamb in rice formula in the store. In our community, the prices at PetSmart are more economical than anywhere else. The dogs love it, although we periodically buy other flavors (of Purina One) to see how they like it. So far, lamb and rice is their favorite but we completed the trial fairly recently, so will try them on other flavors periodically.
Although we did the trial with the dogs, we are also buying Purina One for the cat because we had such good luck with the dogs. (The cat was very interested in the new dog food, so we just started buying it for him without doing a trial.) It is interesting that our animals smell the bags of food immediately when we bring them in the house from the store. The bags are still sealed. They know the food is for them, and the cat always demands a dish of it immediately. He is very obnoxious if he doesn't get it.
Our animals are healthy and happy, and the Purina One is much more economical than the products we were using previously. I'm sure this is because the other products are full of cereal fillers and the Lamb and rice formula is not. They eat less, and are well satisfied. Because of this, our daily cost is actually lower than it was previously.
We appreciate the coupons and other perks that Purina has provided.