Max has been on NB for about 4 months now and he loves it. I didn't even have to do a transition between food. From day 1 that I mixed NB with his other food he ate all of the NB kibble and left the other one and didn't want to eat it.
He goes crazy for it every morning and now they have the small bites which is a smaller kibble of the same stuff. Oh Max also says to get your puppy their treats they are all natural and good.
He loves the Turkey, oatmeal, and cranberry treats biscuits.