Haven't tried any food from buttermilk, but if their shelf life is any indication their food is much fresher than MTRs. MTR's packets are good for at least a year (and taste like it - they are passable in a pinch but definitely have that preservative taste to them). I think buttermilk is competing with freshly made or restaurant quality food.

Edit: was wrong about MTR using preservatives, but I've always found their food to have an off taste.